FYN and Alzheimer disease: To confirm that the extent of Src pTyr416 and Src pTyr527 phosphorylation was due to Fyn and not to other members of the Src protein family, which Fyn belongs to Martin (2001), we performed IP analysis using an antibody against Fyn endogenous level in control (C18, C16) and AD neurons and we analyzed samples using anti-Src pTyr416 and anti-Src pTyr527 antibodies.