in order to compare the differentiation potential of such progenitors in various ontogenical stages , we have established a number of cell lines from fetal livers ( lfd series ) , fetal thymus ( ftd15 ) , newborn spleens ( sed series ) , and adult spleens ( spb series ) using the il-3/il-2 culture system .
C1517162
fetal livers
C0015965
fetal