protein content and protein composition were studied in amniotic fluid obtained from 171 healthy pregnant women between the 16th and 38th week of gestation , using microgradient gel electrophoresis to separate proteins according to their molecular size into albumin ( 68 kd ) , proteins of low molecular weight ( lmw proteins , less than 68 kd ) , and proteins of high molecular weight ( hmw proteins , greater than 68 kd ) .
C0001924
albumin
C0033684
proteins