the proliferation and morphology of astroglia derived from neonatal rat cortex and cultured in serum-free medium on either untreated , or fibronectin- , or collagen i- , or collagen iv-treated substrates were investigated using tritiated thymidine autoradiography and immunocytochemical staining of glial fibrillary acidic protein ( gfap ) and actin .
C0009325
collagen
C0009333
collagen iv