Fig. 3.

Species- and strain-specific enrichment of GPCR peptide ligand genes. Data are presented as mean + SEM relative to Actb, Gapdh, Ppia, Tbp and Tfrc for four human islet donors and four ICR and four C57 mouse islet preparations. T denotes trace expression and A denotes absent expression. a Expression of 42 GPCR peptide ligand genes that are expressed above trace level in human islets, but either absent or present only at trace level in either ICR or C57 mouse islets. b Expression of 21 GPCR peptide ligand genes that are expressed above trace level in ICR or C57 mouse islets, but either absent or present only at trace level in human islets