DIFFERENTIATION OF KIDNEY MESENCHYME
257
CPM
2000'
1000H
1000 •
800600
400200 H
URIDINE -
3
H
#--THYMIDINE - °H
O INDUCED
•
UN IN DUCED
I
I
1
1
1
1
8
16
2U
30
48
72
HOURS OF CULTIVATION
96
120
FIG. 2. One-hour incorporation of uridine3
H (10 /icuries/ml) and thymidine3
H
(5 /xcuries/ml) into trichloracetic acid-insoluble form in mesenchymal explants
cultured for varying lengths of time. Each dot represents a pooled sample of thirty
mesenchymes.