I'm search for variants listed in ExAC, to find that only 'non coding transcripts' registed in ExAC browser. The gene I have interest in is ABO, the most variants listed annotated as "non coding transcript exon". (http://exac.broadinstitute.org/gene/ENSG00000175164) Do you have any experiences to deal with this problem? I have no idea why there are only non coding transcript for ABO, which is obviously a functional gene in human.