CAV1 and infection: “...we also found colocalization of fusion-defective fluorescent A-MLV virions with caveolin-1 in NIH 3T3 cells.” CONTROVERSIAL “A-MLV is internalized not by caveolae or other pinocytic mechanisms but by macropinocytosis. A-MLV infection of mouse embryonic fibroblasts deficient for caveolin or dynamin, and NIH 3T3 cells knocked down for caveolin expression, was unaffected.”