Schematic diagram of the genes encoding ghrelin ( GHRL ) and the ghrelin receptor ( GHSR ). Exons are shown as boxes, introns as lines. The canonical coding exons of GHSR1a (cognate ghrelin receptor; GHSR) and ghrelin (GHRL) are shown as black boxes. Exon I and II (white boxes) are unique to the GHRL splice variant in2c-ghrelin. The SNPs examined in this study are indicated.