A. E. Schaefer,
S. B. Tove,
C. K. Whitehair and
C. A. Elvehjem
Departments of Biochemistry and Veterinary Science, College of Agriculture, University of Wisconsin, Madison
1. Mink kits and adults fed highly purified rations supplementedwith all the known crystalline vitamins require additional unidentifiedfactors for normal nutrition. The characteristic deficiencysymptoms are described.
2. Preliminary evidence from the fractionationof the unidentifiedfactors in fresh raw liver indicates thatmethanol extractionremoves 1 factor(s) and that the insolubleresidue containsanother factor(s).
1 Published with the approval of the Director of the WisconsinAgricultural Experiment Station. These studies were supportedby project 614, Wisconsin Agricultural Experiment Station, anda grant from the Wander Company, Chicago, Illinois.