Other genes within the CHD critical region also overlap CNVs: a common intronic deletion (10%) was identified in C2CD2 (Conrad et al. 2010) ; 6 CNVs have been reported within PRDM15, including one deletion overlapping 5 exons that was found in 3/90 Yoruban individuals (Matsuzaki et al. 2009 ); and one deletion was identified in BACE2 overlapping the last exon of this gene (Mills et al. 2006) .