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Science 19 November 1965:
Vol. 150. no. 3699, pp. 1028 - 1030
DOI: 10.1126/science.150.3699.1028
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Articles

Visual Excitation and Blood Clotting

George Wald 1

1 Biological Laboratories, Harvard University, Cambridge, Massachusetts

Both processes involve extremely large amplification between the stimulus and the response. In vision it had been suggested that thismight be achieved by a chain of successive proenzyme-enzyme activations. Such a chain has now been found to underlie the mechanism of blood clotting. Methods are suggested for pursuing this comparison further.


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