

• 





* 



B 



Plate XI. Alkaline phosphatase of chick osteoblast cultures. Cultures 

 by H. B. Fell. Fixative 80 percent alcohol; incubation time, 1280 minutes; 

 substrate, glycerophosphate. Figure A, prophase and intermitotic nuclei: 

 note high phosphatase concentration in nucleoli, still visible in prophase, 



