COL2A1 and brain disorder: This proved interesting in that (1) all of the allele-wise associations were more significant in comparisons of mothers (Table 4) than in comparisons of infants (Table 1), (2) additional ABCA4 (rs952499) and COL2A1 (rs2070739, rs1635544) were associated with mothers of affected infants compared to mothers of unaffected infants (Table 4), and (3) all of the ABCA4 SNPs but none of the COL2A1 SNPs were associated with mothers of infants with brain disease (Table 4, note also footnote on mothers of children with brain disease only).