1 Department of Pediatrics, University of Colorado Medical School, 4200 E. Ninth Avenue, Denver, Colorado 80220
In his letter to the Editor, Dr. Graham has requested information concerning, (i) the properties of arginine, (ii) the adequacy of controls for the inhalation and fat absorbtion studies. In answer to these questions the following can be stated: (i) the properties of arginine discussed in the paper have been documented by Clarke, E. R. and Martell, A. G., J. Inorg. Nucl. Chem., 23:911-926, 1970, and Hardel M., and Hoppe Seyl. Z.: Physiol. Chem., 346:224-228, 1966.