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why does Pfam-A.fasta not contain all the sequences of a family?

Hello everyone, I'm working on collecting sequences of each pfam family.

And I realize Pfam-A.fasta (ftp://ftp.ebi.ac.uk/pub/databases/Pfam/releases/Pfam28.0/relnotes.txt) consists of sequences in fasta format with PFAM accession, but it does not contain all the sequences of a family.

My question is, What kind of sequence would be excluded in this file? And why?

For example, Piwi family should have 3,833 sequences, but there are only 1,893 sequences in Pfam-A.fasta.

Thanks!

pfam-a
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updated by Ram Ram • written by ifishlin324 • ifishlin324

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