Summary of the endogenous peptides identified from rat brain.
A, Overlap of unique peptides identified from hypothalamus (HT), hippocampus (hippo), nucleus accumbens (NAc), and dorsal striatum (DS). B, Overlap of peptides carrying pyro-Glu modification and C-terminal amidation. Distribution of the number of peptides per protein (shown in parenthesis) for the precursors yielding more than 5 peptides from NAc (C), HT (D), hippo (E) and DS (F).