The presence of vitamin A in human tryptophan-rich prealbumin

Abstract

Human tryptophan-rich prealbumin has been isolated from serum and its homogeneity evaluated by immunoelectrophoresis and polyacrylamide-gel electrophoresis. The green fluorescence of the protein when exposed to ultraviolet light was shown to be due to the presence of vitamin A. It is suggested that trytophanrich prealbumin represents the hitherto unknown specific transport protein for vitamin A.