when nih 3t3 clonal sublines were selected by transfection of tgf-alpha expression vectors in the presence of a dominant selectable marker , they were shown to secrete large amounts of tgf-alpha into the medium , to have downregulated egf receptors , and to be inhibited in growth by tgf-alpha monoclonal antibody .
C0040688
tgf-alpha
C0040691
growth