given:
a peptide.csv as
DKEKEK
EKEKEK
and a protein.fasta (expected hit in second line) as
>sp|Q95283|COX41_PIG Cytochrome c oxidase subunit 4 isoform 1, mitochondrial (Fragment) OS=Sus scrofa OX=9823 GN=COX4I1 PE=2 SV=1
MLATRVFNLIGRRAISTSVCVRAHGSXVKSEDYALPVYVDRRDYPLPDVAHVKNLSASQKA
XKEKEK
ASWSSLSMDEKVELYRLKFNESFAEMNRST
the result of PeptideMapper is:
XKEKEK,Q95283,62
The position is correct, but PeptideMapper does not tell how many peptides were matched to this position (here it's 2).
To perform this mapping, one needs external tools, which is a bit inconvenient.
I would hope to see a result like:
EKEKEK,Q95283,62
DKEKEK,Q95283,62
which would tell me the actual peptide sequence(s) matched