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Biol Bull 86: 51-80. (February 1944)
© 1944 Marine Biological Laboratory
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LOCALIZATIONS OF ALKALINE AND ACID PHOSPHATASES IN THE EARLY EMBRYOGENESIS OF THE CHICK

FLORENCE MOOG 1

1 Department of Zoology, Washington University, Saint Louis

1. Both acid and alkaline phosphatases are present in the unincubated blastoderm of the hen's egg, and in all embryonic tissues during the first two or three days of development. The concentration of alkaline phosphatase is much greater than that of acid phosphatase.

2. Phosphatase persists as long as a tissue remains undifferentiated. As differentiation proceeds, phosphatase in some cases disappears and in others accumulates in higher concentration than in the primitive phase. Alkaline phosphatase is more widespread than acid.

3. The changes in phosphatase distribution in the principal soft organs up to the eighth day, and the relation of alkaline phosphatase to bone deposition in the hind limb up to the eleventh day, are considered.

4. The effects of a variety of chemical agents on both phosphatases are reported.

5. The possible significance of phosphatases in the processes of embryogenesis is discussed.






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