for more information on psd-95 check out these references ( you can find them by searching the online pubmed database athttp : //www.ncbi.nlm.nih.gov/pubmed/ ) : 1.alaa el-din el-husseini , eric schnell , dane m. chetkovich , roger a. nicoll , and david s. bredt , psd-95 involvement in maturation of excitatory synapses , 17 november 2000 , science 290 ( 5495 ) , 1364 .