as reported previously ( nicholls , a. c. , pope , f. m. , and schloon , h. ( 1979 ) lancet 1 , 1193 ) , the cells synthesized and secreted a type i procollagen which lacked pro-alpha 2 ( i ) chains and consisted of a trimer of pro-alpha 1 ( i ) chains .
C0007634
cells
C1327616
secreted