t t: ^ • t if ' f •# "# V ■•'# 'r "-^^^ ""^ "n 



MillMMIÉUttlill«4rM»Wyt»».lllto i-~..^.a..i~u-l>il.a^u;;^ ^ .,1 , 



18] STRUCTURE OF PITUITARY HORMONES 327 



representing the structural center responsible for the growth-promoting 

 activity. 



Acknowledgements. Experimental work mentioned herein was aided in part by 

 grants from the National Institutes of Health, U.S. Public Health Service (Nos. 

 G-2907 and RG-4097), the American Cancer Society upon recommendation of 

 the Committee on Growth of the National Research Council, and the Albert and 

 Mary Lasker Foundation. 



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