i read the illumina premers document
ther is a "P" letter in the front of adapters1
what does it mean?

thx
shan gao

Genomic DNA/ChIP-Seq oligonucleotide sequences
 Adapters1
 5' P-GATCGGAAGAGCTCGTATGCCGTCTTCTGCTTG
 5' ACACTCTTTCCCTACACGACGCTCTTCCGATCT
 PCR Primers1
 5' AATGATACGGCGACCACCGAGATCTACACTCTTTCCCTACACGACGCTCTTCCGATCT
 5' CAAGCAGAAGACGGCATACGAGCTCTTCCGATCT
 Genomic DNA Sequencing Primer
 5' ACACTCTTTCCCTACACGACGCTCTTCCGATCT
Paired End DNA oligonucleotide sequences
 PE Adapters1
 5' P-GATCGGAAGAGCGGTTCAGCAGGAATGCCGAG
 5' ACACTCTTTCCCTACACGACGCTCTTCCGATCT
 PE PCR Primers1
 5' AATGATACGGCGACCACCGAGATCTACACTCTTTCCCTACACGACGCTCTTCCGATCT
 5' CAAGCAGAAGACGGCATACGAGATCGGTCTCGGCATTCCTGCTGAACCGCTCTTCCGATCT
 PE Sequencing Primer
 5' ACACTCTTTCCCTACACGACGCTCTTCCGATCT
 5' CGGTCTCGGCATTCCTGCTGAACCGCTCTTCCGATCT

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