Schematic of the exon structure of Kirrel3 A and B mRNA transcripts. A – Schematic of the exon structure of Kirrel3 A and B mRNA transcripts. Start codon is highlighted as ATG and stop codon as TAA. The unusually large first intron is highlighted. The exons to which primers are targeted are also shown. PS1F – Primer set 1 forward primer, PS2F – Primer set 2 forward primer, PS1R – Primer set 1 reverse primer, PS3R – Primer set 3 reverse primer. B – Schematic of the predicted protein domains and putative N-linked glycosylation sites of Kirrel3 A and B.