ADGRB1 and breast neoplasm: The second one is 699aa long and is encoded by three of the novel human mRNAs (7/3 in cerebral cortex and PB.34262.1 and 62.3 in breast tumors) that have a new start codon (ATG) in their alternative first exon that is in-frame with exon 18 codons of full-length ADGRB1. The predicted size of this isoform is 76.9 kDa, and it features a 60aa long N terminus (Fig. 7 and Supplementary Figure S2) with 7 novel amino acids (white circle in Fig. 7 and Supplementary Figure S2) that are absent in FL-BAI1.