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American Zoologist 1974 14(2):633-645; doi:10.1093/icb/14.2.633
© 1974 by The Society for Integrative and Comparative Biology
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The Basal Inhibition in Hydra may be Mediated by a Diffusing Substance

HARRY K. MacWILLIAMS and FOTIS C. KAFATOS
The Biological Laboratories, Harvard University Cambridge, Massachusetts 02138

The decay, following basal disk removal, of the disk-mediated inhibition of disk formation in hydra is as slow as would be expected, were the inhibition mediated by a diffusing substance.

When a hydra's size is changed, either by adding or by removing mass, the inhibition intensity changes in the manner expected if the vehicle of the inhibition is a substance diffusing from the disk and destroyed by all the cells of the body.


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