LIMK1 and Williams syndrome: The results of both the short deletion and the two general population studies support the hypothesis that LIMK1 plays an important role in the structural and functional development of the IPS dorsal stream region — specifically that these observations may be the downstream neurostructural and neurofunctional effects of differences (induced by either allelic variation as in the general population or haploinsufficiency as is the case in Williams syndrome and the participants with short deletions) in the function of LIMK1 protein.