the second fraction was enriched in the 225 000 , 196 000 and 173 000 dalton labeled proteins , the ecm proteins laminin and fibronectin , and the 43 000 actin band . it is proposed that 125i-labeled proteins in the former cell fraction are truly plasma membrane proteins , while those found in the latter cell fraction are a mixture of 125i-labeled ecm and basal plasma membrane proteins .
C0022984
laminin
C0015350
ecm