Table 3.

Analyses of naturally processed peptide families isolated from homozygous and heterozygous APC lines

Peptides	n
I-Ag7 peptides (n = 90)
Peptides found in g7+ and absent in g7+d+	7
Peptides found in g7+ and absent in g7+PD+	8
Peptides found in g7+ and absent in both double lines	2
Peptides found in g7+PD+ and absent in g7+	1
Peptides found in g7+d+ and absent in g7+	1
I-Ad peptides (n = 85)
Peptides found in d+ and absent in g7+d+	11
Peptides found in g7+d+ and absent in d+	4

Note that the peptides marked as absent were present in their original source in low abundances; most were present in amounts that were <5% of the most abundant peptide. This made it unreliable for us to definitively establish their presence in a complex peptide extract (listed in detail in Tables 4 and 5).