FastQCFastQC Report
Thu 1 Sep 2022
EGAF00002449671

Summary

[OK]Basic Statistics

MeasureValue
FilenameEGAF00002449671
File typeConventional base calls
EncodingSanger / Illumina 1.9
Total Sequences20600
Sequences flagged as poor quality0
Sequence length301
%GC52

[FAIL]Per base sequence quality

Per base quality graph

[FAIL]Per tile sequence quality

Per tile quality graph

[FAIL]Per sequence quality scores

Per Sequence quality graph

[FAIL]Per base sequence content

Per base sequence content

[FAIL]Per sequence GC content

Per sequence GC content graph

[FAIL]Per base N content

N content graph

[OK]Sequence Length Distribution

Sequence length distribution

[FAIL]Sequence Duplication Levels

Duplication level graph

[FAIL]Overrepresented sequences

SequenceCountPercentagePossible Source
CCTGTTTGCTCCCCACGCTTTCGAGCCTCAGCGTCAGTTATCGTCCAGTA5212.529126213592233No Hit
CCTGTTTGCTACCCACACTTTCGAGCCTCAGCGTCAGTTGGTGCCCAGTA4672.266990291262136No Hit
CCTGTTTGATACCCACACTTTCGAGCCTCAATGTCAGTTGCAGCTTAGCA4352.111650485436893No Hit
CCCGTTCGCTACCCTAGCTTTCGAGCCTCAGCGTCAGTTACAGTCCAGAA3431.6650485436893205No Hit
CCTGTTTGCTACCCATGCTTTCGAGCCTCAGCGTCAGTTGGTGCCCAGTA2491.2087378640776698No Hit
CCTGTTTGCTACCCACGCTTTCGTGCCTCAGCGTCAGTTAAAGCCCAGCA1990.9660194174757282No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTCAGCGTCAGTTATCGTCNAGTA1920.9320388349514563No Hit
CCTGTTTGCTACCCACACTTTCGAGCCTCAGCGTCAGTTGGTGCNCAGTA1880.912621359223301No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTCAGCGTCAGTTATCGTNNAGTA1760.854368932038835No Hit
CCTGTTTGCTACCCACACTTTCGAGCCTCAGCGTCAGTTGGTGCCNAGTA1740.8446601941747572No Hit
CCTGTTTGATACCCACACTTTCGAGCATCAATGTCAGTTACAGGTTAGTA1640.7961165048543689No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTCAGCGTCAGTTATCGTNCAGTA1640.7961165048543689No Hit
CCTGTTTGATACCCACACTTTCGAGCCTCAATGTCAGTTGCAGCNTAGCA1580.7669902912621359No Hit
CCTGTTTGCTACCCACACTTTCGAGCCTCAGCGTCAGTTGGTGCNNAGTA1570.7621359223300971No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTCAACGTCAGTTACCGTCCAGTA1490.7233009708737864No Hit
CCCGTTCGCTACCCTAGCTTTCGAGCCTCAGCGTCAGTTACAGTNNAGAA1360.6601941747572815No Hit
CCTGTTTGATACCCACACTTTCGAGCCTCAATGTCAGTTGCAGCNNAGCA1350.6553398058252428No Hit
CCTGTTTGCTACCCACACTTTCGAGCCTCAGCGTNAGTTGGTGCCCAGTA1330.6456310679611651No Hit
CCTGTTTGATACCCACACTTTCGAGCATCAGCGTCAGTTACAGTCCAGCA1310.6359223300970874No Hit
CCTGTTTGATACCCACACTTTCGAGCCTCAATGTCAGTTGCAGCTNAGCA1270.616504854368932No Hit
CCCGTTCGCTACCCTAGCTTTCGAGCCTCAGCGTCAGTTACAGTNCAGAA1250.6067961165048543No Hit
CCTGTTTGATACCCACACTTTCGAGCATCAGCGTCAGTTATAATCCAGTA1210.587378640776699No Hit
CCTGTTTGCTCCCCACGCTTTCGCGCCTCAGCGTCAGTTAATGTCCAGCA1190.5776699029126213No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTCAGCGTNAGTTATCGTCCAGTA1130.5485436893203884No Hit
CCTGTTTGCTACCCATGCTTTCGAGCCTCAGCGTCAGTTGGTGCCNAGTA1110.5388349514563107No Hit
CCCGTTCGCTACCCTAGCTTTCGAGCCTCAGCGTCAGTTACAGTCNAGAA1070.5194174757281553No Hit
CCTGTTTGATACCCGCACTTTCGAGCCTCAGCGTCAGTTATGCCCCGGCA990.48058252427184467No Hit
CCTGTTTGCTCCCCACGCTTTCGCACCTGAGCGTCAGTCTTCGTCCAGGG980.47572815533980584No Hit
CCTGTTTGCTACCCATGCTTTCGAGCCTCAGCGTCAGTTGGTGCNCAGTA940.4563106796116505No Hit
CCTGTTTGATACCCACACTTTCGAGCCTCAATGTNAGTTGCAGCTTAGCA910.44174757281553395No Hit
CCTGTTTGCTACCCATGCTTTCGAGCCTCAGCGTCAGTTGGTGCNNAGTA880.4271844660194175No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTCAACGTCAGTTACTGTCCAGTA870.4223300970873786No Hit
CCCGTTCGCTACCCTAGCTTTCGAGCCTCAGCGTNAGTTACAGTCCAGAA740.3592233009708738No Hit
CCTGTTTGCTACCCACGCTTTCGTGCCTCAGCGTCAGTTAAAGCNNAGCA670.3252427184466019No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTCAACGTCAGTTACCGTNCAGTA670.3252427184466019No Hit
CCTGTTTGCTACCCACGCTTTCGTGCCTCAGCGTCAGTTAAAGCNCAGCA670.3252427184466019No Hit
CCTGTTTGCTACCNACACTTTCGAGCNTCAGNGTNAGTTGGNGCNCAGTA670.3252427184466019No Hit
CCTGTTTGCTCCCCACGCTTTNGAGCCTCAGCGTCAGTTATCGTCCAGTA670.3252427184466019No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTCAGTGTCAGTTACAGTCCAGCA660.3203883495145631No Hit
CCCGTTCGCTACCCTGGCTTTCGCATCTCAGCGTCAGACACAGTCCAGAA630.30582524271844663No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTNAGCGTCAGTTATCGTNCAGTA630.30582524271844663No Hit
CCTGTTNGCTACCCACACTTTCGAGCCTCAGCGTCAGTTGGTGCCCAGTA630.30582524271844663No Hit
CCTGTTTGATACCNACACTTTCGAGCCTCAATGTCAGTTGCAGCNTAGCA630.30582524271844663No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTCAACGTCAGTTACCGTCNAGTA620.3009708737864078No Hit
CCCGTTCGCTACCNTAGCTTTCGAGCCTCAGCGTCAGTTACAGTNCAGAA620.3009708737864078No Hit
CCTGTTNGCTCCCCACGCTTTCGAGCCTCAGCGTCAGTTATCGTCCAGTA610.29611650485436897No Hit
CCTGTTTGCTCCCNACGCTTTCGAGCNTCAGNGTNAGTTATNGTNCAGTA610.29611650485436897No Hit
CCTGTTTGCNACCCACACTTTCGAGCCTCAGCGTCAGTTGGTGCNCAGTA600.2912621359223301No Hit
CNTGTTTGCTACCCACACTTTCGAGCCTCAGCGTNAGTTGGTGCCCAGTA590.28640776699029125No Hit
CCTGTTNGATACCCACACTTTCGAGCCTCAATGTCAGTTGCAGCTTAGCA590.28640776699029125No Hit
CCTGTTTGCTACCCACGCTTTCGTGCCTCAGCGTCAGTTAAAGCCNAGCA580.2815533980582524No Hit
CCTGTTTGATACCCACACTTTNGAGCCTCAATGTCAGTTGCAGCTTAGCA580.2815533980582524No Hit
CCTGTTTGCTCCCNACGCTTTCGAGCCTCAGCGTCAGTTATCGTNCAGTA570.2766990291262136No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTCAGNGTCAGTTATCGTNNAGTA560.27184466019417475No Hit
CCTGTTNGCTCCCCACGCTTTCGAGCCTCAGCGTCAGTTATCGTNCAGTA560.27184466019417475No Hit
CCTGTTTGATACCCACACTTTCGAGCATCAATGTCAGTTACAGGNNAGTA560.27184466019417475No Hit
CCTGTTTGCTCCCCACACTTTCGCGCCTCACCGTCAGTTATCGTCCAGCA550.2669902912621359No Hit
CCTGTTTGCTCCCCACGCTTTCGTGCCTCAACGTCAGATATAGTTTGGTA550.2669902912621359No Hit
CCTGTTTGCNCCCCACGCTTTCGAGCCTCAGCGTCAGTTATCGTNCAGTA540.2621359223300971No Hit
CNTGTTTGCTCCCCACGCTTTCGAGCCTCAGCGTNAGTTATCGTCCAGTA540.2621359223300971No Hit
CCTGTTTGCTACCCACACTTTCGAGCCTNAGCGTCAGTTGGTGCNCAGTA540.2621359223300971No Hit
CCTGTTTGATACCCACACTTTCGAGCCTCAATGTNAGNTGCAGCTTAGCA530.25728155339805825No Hit
CCTGTTTGCTCCCCACGCTTTCGCGCCTCAGCGTCAGTTAATGTNNAGCA530.25728155339805825No Hit
CCTGTTTGCTACCNACACTTTCGAGCCTCAGCGTCAGTTGGTGCNCAGTA530.25728155339805825No Hit
CNTGTTTGATACCCACACTTTCGAGCCTCAATGTNAGTTGCAGCTTAGCA530.25728155339805825No Hit
CCTGTTTGCTACCCATGCTTTCGAGCCTCAGCGTNAGTTGGTGCCCAGTA520.2524271844660194No Hit
CCCGTTNGCTACCCTAGCTTTCGAGCCTCAGCGTCAGTTACAGTCCAGAA520.2524271844660194No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTCAACGTCAGTTACCGTNNAGTA510.24757281553398056No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTCAGCGTNAGNTATCGTCCAGTA510.24757281553398056No Hit
CCTGTTTGATACCCACACTTTCGAGCATCAATGTCAGTTACAGGNTAGTA480.23300970873786409No Hit
CCTGTTTGCTACCCACACTTTNGAGCCTCAGCGTCAGTTGGTGCCCAGTA480.23300970873786409No Hit
CCCGTTNGCTACCCTAGCTTTCGAGCCTCAGCGTCAGTTACAGTNCAGAA480.23300970873786409No Hit
CCTGTTTGATACCCACACTTTCGAGCCTCAANGTCAGTTGCAGCNNAGCA480.23300970873786409No Hit
CCTGTTCGCTCCCCACGCTTTCGCTCCTCAGCGTCAGTAACGGCCCAGAG470.22815533980582525No Hit
CCTGTTTGATACCCACACTTTCGAGCATGAACGTCAGTTACGGCTTAGTG470.22815533980582525No Hit
CCTGTTNGCTACCCACACTTTCGAGCCTCAGCGTCAGTTGGTGCNCAGTA470.22815533980582525No Hit
CCTGTTNGATACCCACACTTTCGAGCCTCAATGTCAGTTGCAGCNTAGCA470.22815533980582525No Hit
CCTGTTTGATACCCACACTTTCGAGCATCAGCGTCAGTTACAGTNCAGCA460.22330097087378642No Hit
CCTGTTTGATACCCACACTTTCGAGCATCAATGTCAGTTACAGGTNAGTA460.22330097087378642No Hit
CCTGTTTGCTCCCCACGCTTTCGTGCCTCAGTGTCAGTAGCAGTCCAGTA450.2184466019417476No Hit
CCTGTTTGANACCCACACTTTCGAGCCTCAATGTCAGTTGCAGCNTAGCA450.2184466019417476No Hit
CCCGTTCGCTACCCTAGCTTTCGAGCCTNAGCGTCAGTTACAGTNCAGAA440.21359223300970875No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTGAACGTCAGTTACTGTCCAGCA440.21359223300970875No Hit
CCTGTTTGATACCCACACTTTCGAGCATCAGCGTCAGTTATAATNCAGTA440.21359223300970875No Hit
CCCGTTCGCTACCNTAGCTTTCGAGCNTCAGNGTNAGTTACNGTNCAGAA440.21359223300970875No Hit
CCTGTTTGCTACCCACACTTTCGAGCCTCAGNGTCAGTTGGTGCNNAGTA430.2087378640776699No Hit
CCCGTTCGCTACCCTAGCTTTCGAGCCTCAGCGTNAGNTACAGTCCAGAA430.2087378640776699No Hit
CCTGTTTGATACCCACACTTTCGAGCCTNAATGTCAGTTGCAGCNTAGCA410.19902912621359223No Hit
CCTGTTTGCTACCCATGCTTTCGAGCCTCAGNGTCAGTTGGTGCNNAGTA410.19902912621359223No Hit
CCTGTTTGCTACCCACGCTTTCGTGCCTCAGCGTNAGTTAAAGCCCAGCA390.18932038834951456No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTCAACGTCAGTTACTGTCNAGTA390.18932038834951456No Hit
CCTGTTTGATACCCACACTTTCGAGCATCAGCGTCAGTTATAATCNAGTA390.18932038834951456No Hit
CCCGTTCGCTACCCTAGCTTTCGAGCCTCAGNGTCAGTTACAGTNNAGAA390.18932038834951456No Hit
CCTGTTTGATACCCACACTTTCGAGCATCAGCGTCAGTTATAATNNAGTA390.18932038834951456No Hit
CCTGTTTGATACCCACACTTTCGAGCATCAGCGTCAGTTACAGTCNAGCA380.18446601941747573No Hit
CCTGTTTGATACCNACACTTTCGAGCNTCAANGTNAGTTGCNGCNTAGCA380.18446601941747573No Hit
CCTGTTNGCTACCCATGCTTTCGAGCCTCAGCGTCAGTTGGTGCCCAGTA380.18446601941747573No Hit
CCTGTTTGATACCCACACTTTCGAGCATCAGTGTCAGTTGCAGTCCAGTG380.18446601941747573No Hit
CCTGTTTGCTCCCCACGCTTTCGCGCCTCAGCGTCAGTTAATGTNCAGCA380.18446601941747573No Hit
CCTGTTTGCTACCCACACTTTCGAGCCTCAGCGTNAGNTGGTGCCCAGTA370.1796116504854369No Hit
CCTGTTTGCTCCCCACGCTTTCGCGCCTCAGCGTCAGTTATCGTCCAGTT370.1796116504854369No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTCAACGTNAGTTACTGTCCAGTA370.1796116504854369No Hit
CCTGTTTGCTCCCCACGCTTTCGCGCCTCAGCGTNAGTTAATGTCCAGCA370.1796116504854369No Hit
CCTGTTTGCTACCCATGCTTTCGAGCCTNAGCGTCAGTTGGTGCNCAGTA360.17475728155339806No Hit
CCTGTTTGATACCCGCACTTTCGAGCCTCAGCGTCAGTTATGCCNCGGCA360.17475728155339806No Hit
CCTGTTTGATACCCGCACTTTCGAGCCTCAGCGTCAGTTATGCCCNGGCA360.17475728155339806No Hit
CCTGTTTGCTACCNATGCTTTCGAGCCTCAGCGTCAGTTGGTGCNCAGTA350.16990291262135923No Hit
CCCGTTCGCTACCCTCGCTTTCGAGCCTCAGCGTCAGTTACAGTCCAGAA340.16504854368932037No Hit
CCCGTTCGCTACCCTAGCTTTNGAGCCTCAGCGTCAGTTACAGTCCAGAA340.16504854368932037No Hit
CCTGTTNGCTACCCATGCTTTCGAGCCTCAGCGTCAGTTGGTGCNCAGTA330.16019417475728154No Hit
CCTGTTTGCTCCCCACGCTTTCGCACCTGAGCGTCAGTCTTCGTNNAGGG330.16019417475728154No Hit
CCTGTTTGCTACCCATGCTTTCGAGCCTCAGCGTNAGNTGGTGCCCAGTA320.15533980582524273No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTCAACGTNAGTTACCGTCCAGTA320.15533980582524273No Hit
CCCGTTCGCTACCCTGGCTTTCGCATCTCAGCGTCAGACACAGTCNAGAA320.15533980582524273No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTCAACGTCAGTTACTGTNNAGTA310.1504854368932039No Hit
CCTGTTNGCTCCCCACGCTTTCGAGCCTCAACGTCAGTTACCGTNCAGTA310.1504854368932039No Hit
CCTGTTTGCTCCCCACGCTTTCGCGCCTCAGCGTCAGTTAATGTCNAGCA310.1504854368932039No Hit
CCTGTTTGATACCCACACTTTCGAGCATCAATGTNAGTTACAGGTTAGTA310.1504854368932039No Hit
CCCGTTCGCNACCCTAGCTTTCGAGCCTCAGCGTCAGTTACAGTNCAGAA310.1504854368932039No Hit
CNTGTTTGCTACCCATGCTTTCGAGCCTCAGCGTNAGTTGGTGCCCAGTA310.1504854368932039No Hit
CCTGTTTGATACCCACACTTTCGAGCATCAGCGTCAGTTACAGTNNAGCA300.14563106796116504No Hit
CCTGTTTGCTCCCCACGCTTTCGCACCTGAGCGTCAGTCTTCGTNCAGGG300.14563106796116504No Hit
CCTGTTTGATACCCACACTTTCGAGCATGAACGTCAGTTACGGATTAGTG300.14563106796116504No Hit
CCTGTTTGATACCCACACTTTCGAGCATCAGCGTNAGTTACAGTCCAGCA290.1407766990291262No Hit
CCTGTTTGCNACCCATGCTTTCGAGCCTCAGCGTCAGTTGGTGCNCAGTA290.1407766990291262No Hit
CCTGTTNGATACCCACACTTTCGAGCATCAATGTCAGTTACAGGNTAGTA290.1407766990291262No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTCAGTGTCAGTTACAGTNCAGCA290.1407766990291262No Hit
CCTGTTNGCTACCCACGCTTTCGTGCCTCAGCGTCAGTTAAAGCNCAGCA290.1407766990291262No Hit
CNCGTTCGCTACCCTAGCTTTCGAGCCTCAGCGTNAGTTACAGTCCAGAA290.1407766990291262No Hit
CCTGTTTGATACCCACACTTTCGAGCATCAGCGTCAGTTACAATCCAGTA280.13592233009708737No Hit
CCTGTTTGCTCCCCACGCTTTCGCACCTGAGCGTCAGTCTTCGTCNAGGG280.13592233009708737No Hit
CCTGTTTGCTACCCATGCTTTNGAGCCTCAGCGTCAGTTGGTGCCCAGTA280.13592233009708737No Hit
CCTGTTTGCNCCCCACGCTTTCGAGCCTCAACGTCAGTTACCGTNCAGTA270.13106796116504854No Hit
CCTGTTTGCTCCCCACGCTTTCGCGCCTCACCGTCAGTTGTCGTCCAGCA270.13106796116504854No Hit
CCCGTTCGCTACCCTGGCTTTCGCATCTCAGCGTCAGACACAGTNCAGAA270.13106796116504854No Hit
CCTGTTTGATACCCGCACTTTCGAGCCTCAGCGTCAGTTATGCCNNGGCA260.1262135922330097No Hit
CCCGTTCGCTACCCTGGCTTTCGCATCTCAGCGTCAGACACAGTNNAGAA260.1262135922330097No Hit
CCTGTTTGATACCCACACTTTCGAGCCTCAATGTCAGTTGCAGCCTAGCA260.1262135922330097No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTCAGCGTCAGTTAAAGCCCAGTA260.1262135922330097No Hit
CCTGTTTGCTACCCACGCTTTCGAGCCTCAGCGTCAGTTACAGCCCAGTA250.12135922330097086No Hit
CCTGTTTGCTACCCACGCTTTCGTGCCTCAGCGTNAGNTAAAGCCCAGCA250.12135922330097086No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTGAACGTCAGTTACTGTNCAGCA240.11650485436893204No Hit
CCTGTTTGCTCCCCACGCTTTCGTGCCTCAACGTCAGATATAGTNTGGTA240.11650485436893204No Hit
CCTGTTTGCTACCCACGCTTTCGTGCCTCAGNGTCAGTTAAAGCNNAGCA240.11650485436893204No Hit
CCTGTTTGCTACCNACGCTTTCGTGCCTCAGCGTCAGTTAAAGCNCAGCA240.11650485436893204No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTNAACGTCAGTTACCGTNCAGTA240.11650485436893204No Hit
CCTGTTTGCTCCCNACGCTTTCGAGCNTCAANGTNAGTTACNGTNCAGTA230.11165048543689321No Hit
CCTGTTTGCTCCCCACACTTTCGAGCCTCAGCGTCAGTTAAAGCCCAGTT230.11165048543689321No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTGAACGTCAGTTACTGTNNAGCA230.11165048543689321No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTCAGTGTCAGTTACAGTNNAGCA230.11165048543689321No Hit
CCTGTTTGCTACCNATGCTTTCGAGCNTCAGNGTNAGTTGGNGCNCAGTA230.11165048543689321No Hit
CNTGTTTGCTACCCACGCTTTCGTGCCTCAGCGTNAGTTAAAGCCCAGCA230.11165048543689321No Hit
CCTGTTTGATACCCGCACTTTCGAGCCTCAGCGTNAGTTATGCCCCGGCA220.10679611650485438No Hit
CCTGTTTGATACCNACACTTTCGAGCATCAATGTCAGTTACAGGNTAGTA220.10679611650485438No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTCAGTGTCAGTTACAGTCNAGCA220.10679611650485438No Hit
CCTGTTTGCTCCCCACGCTTTCGTGACTCAGCGTCAGTAACAGTCCAGTA220.10679611650485438No Hit
CCTGTTTGCTCCCCACGCTTTCGTGCCTCAACGTCAGATATAGTNNGGTA210.10194174757281553No Hit
CCTGTTCGCTCCCCACGCTTTCGCTCCTCAGCGTCAGTAACGGCCNAGAG210.10194174757281553No Hit
CCTGTTTGCTCCCCACGCTTTCGAGCCTCAACGTCAGTTACTGTNCAGTA210.10194174757281553No Hit
CCTGTTNGCTACCCACGCTTTCGTGCCTCAGCGTCAGTTAAAGCCCAGCA210.10194174757281553No Hit
CCTGTTTGATACCCACACTTTCGAGCATCAGTGTCAGTTGCAGTCNAGTG210.10194174757281553No Hit
CCTGTTTGATACCCACACTTTCGAGCATCAGCGTNAGNTATAATCCAGTA210.10194174757281553No Hit
CCTGTTTGCTCCCNACGCTTTCGAGCCTCAACGTCAGTTACCGTNCAGTA210.10194174757281553No Hit
CCTGTTTGATACCCACACTTTCGAGCATCAATGTNAGNTACAGGTTAGTA210.10194174757281553No Hit
CCTGTTTGCTCCCCACGCTTTCGTGCCTCAGTGTCAGTAGCAGTCNAGTA210.10194174757281553No Hit

[OK]Adapter Content

Adapter graph