Probably not. The T allele at rs7294919 (“each copy of the T allele was associated with lower hippocampal volume (β=−107.8 mm3, p=2.9×10-11)” ) is very common … like 75%-ish … so, yeah, thanks for my TT genotype Mother Nature … and for yet another part of my body that is, um, small.
Genes 2 Brains 2 Mind 2 Me 