BMC Genomics 2009, 10(Suppl 1):S14 http://www.biomedcentral.com/1471-2164/10/S1/S14 FTisgsuureee4xpression distribution for GPCRs and "downstream genes" Tissue expression distribution for GPCRs and "downstream genes". The numbers of genes that were highly expressed in the tissues and duplicated in different evolutionary time intervals were charted for GPCRs (A) and "downstream genes" (B). Page 7 of 10 (page number not for citation purposes)