Table 5. Example of peptide overlap between human proteins, using haptoglobin.

Haptoglobin-1, haptoglobin-2, and haptoglobin-related protein derived peptide identifications and possible source. Unique peptides assigned to a single protein are in the shaded rows. High matched confidence peptide identifications were those that were found to be identified by the AMT tag approach in at least one specific sample in 2 or 3 triplicates. NP under confidence shows peptides not present in the 2004 HUPO-Jul_Submission set, but was found with the previous 2003 HUPO-Dec_Submission set.

Confidence	Peptide	Haptoglobin 1	Haptoglobin 2	Haptoglobin related protein
High	SPVGVQPILNEHTF	✓	✓	✓
High	AVGDKLPECEAVCGKPK	✓	✓	✓
High	DIAPTLTLYVGK	✓	✓	✓
High	DIAPTLTLYVGKK	✓	✓	✓
High	ILGGHLDAK	✓	✓	✓
High	KQLVEIEK	✓	✓	✓
High	NPANPVQR	✓	✓	✓
High	QLVEIEK	✓	✓	✓
High	SCAVAEYGVYVK	✓	✓	✓
High	VTSIQDWVQK	✓	✓	✓
High	VMPICLPSK	✓	✓	✓
High	TSIQDWVQK	✓	✓	✓
High	GSFPWQAK	✓	✓	✓
High	LRTEGDGVYTLNNEK	✓	✓
High	YQEDTCYGDAGSAFAVHDLEEDTWYATGILSFDK	✓	✓
High	VVLHPNYSQVDIGLIK	✓	✓
High	HYEGSTVPEK	✓	✓
High	HYEGSTVPEKK	✓	✓
High	VMPICLPSKDYAEVGR	✓	✓
High	SPVGVQPILNEHTFCAGMSK	✓	✓
High	TEGDGVYTLNNEK	✓	✓
High	VGYVSGWGR	✓	✓
High	YVMLPVADQDQCIR	✓	✓
High	DYAEVGR	✓	✓
High	GYVSGWGR	✓	✓
High	PPEIAHGYVEHSVR	✓	✓
High	TEGDGVYTLNDK		✓	✓
High	TEGDGVYTLNDKK		✓	✓
High	LRTEGDGVYTLNDK		✓	✓
High	LRTEGDGVYTLNDKK		✓	✓
High	VGYVSGWGQSDNFK			✓
High	VVLHPNYHQVDIGLIK			✓
Low	AVGDKLPECEAVCGK	✓	✓	✓
Low	NYAEVGR			✓
NP	AVGDKLPECEADDGCPKPPEIAHGYVEHSVR		✓
NP	LPECEADDGCPKPPEIAHGYVEHSVR		✓
NP	SPVGVQPILNEHTFCVGMSK			✓