1. Grundy, S.M., E.H. Ahrens, Jr., G. Salen and E. Quintao, J. Clin. Invest. 48:33a (1969).
2. Nair, P.B., and C. Garcia, Anal. Biochem. 29:164 (1969).
3. Bartlett, G.R., J. Biol. Chem. 234:466 (1959).
4. Horning, E.C., and M.G. Horning, in “Methods in Medical Research,” Vol. 12, Edited by R.E. Olson, Year Book Med. Publishers, Chicago, 1970.
5. Horning, E.C., W.J.A. VandenHeuvel and B.G. Creech, in “Methods of Biochemical Analysis,” Vol. XI, Edited by D. Glick, Insterscience Publishers, New York, 1963.