GENETIC STRAINS AND STOCKS 



113 



extended to include guinea pigs. The symbols for strains used are based on the rules 

 for mice. Since few strains are involved, the changes indicated have been made with- 

 out concurrence from anyone, trusting that the changes will be accepted. The des- 

 criptions of the strains are in the same format as for rats and, like the rats, few, if any, 

 of the actual genetic factors involved are known. The list of contributors at the end 

 of the section conforms to that used for mice, and the abbreviations indicated have been 

 checked against both previous lists to avoid duplication. 



Table 33 

 Stocks of guinea pigs of genetic interest 



Name or 

 Symbol 



Synonym(s) 



Remarks 



Silvering origin: This stock was obtained from S. Wright in 1955. charac: 



homozygous for silvering (sisi) and segregating for diminished (didi 

 and Didi), C, c d , c a , P, p, e, and ep. maintained by: Re. 



Waltzing origin: The waltzing manifestation first appeared in 1953 as a 



probable mutation in a noninbred colony maintained by N. charac: 

 the waltzing condition in typical cases shows a structurally normal 

 hearing apparatus at birth, but shortly thereafter the hair cells of 

 Corti's organ begin to disappear, followed by a gradual atrophy and 

 disappearance of the other cellular elements of the organ; the cochlear 

 neurons atrophy more slowly, with some persisting for more than two 

 years; the trait is dominant, with variable expression, maintained 

 by: Mp, N. 



List of symbols for designating substrains and stocks of guinea pigs 



A Antoni van Leeuwenhoekhuis, Am- 



sterdam C, Sarphatistraat 108, Nether- 

 lands (Dr. O. Miihlbock). Ne 



Bk Dr. D. W. van Bekkum, Radiobiological 

 Laboratory, National Health Research 

 Council T.N.O., Lange Kleiweg 139, Re 



Rijswijk (ZH), Netherlands. 



Fn Dr. Frank Fenner, Department of 



Microbiology, The Australian National Rog 



University, Canberra, Australia. 



Icrf Imperial Cancer Research Fund, Cen- 

 tral Laboratories, Burtonhole Lane, The Sm 

 Ridgeway, Mill Hill, N.W. 7, England. 



Ju Dr. Clair W. Jungeblut, Department of Ss 



Microbiology, College of Physicians 

 and Surgeons, Columbia University, Wal 



New York, New York. 



Mp Dr. ' Leo Massopust, Physiological 



Science Department, Southeast Louisi- Yo 



ana Hospital, Mandeville, Louisiana. 



N Dr. D. W. Bailey, Genetics Re- 



search Unit, Laboratory Aids Branch, 



National Institutes of Health, Bethesda, 

 Maryland. 



Dr. W. T. Newton, Scfjpol of Medicine, 

 Washington University, St. Louis, 

 Missouri. 



Dr. Elizabeth S. Russell, R. B. Jackson 

 Memorial Laboratory, Bar Harbor, 

 Maine. 



Dr. J. B. Rogers, Department of 

 Anatomy, School of Medicine, Univer- 

 sity of Louisville, Louisville, Kentucky. 

 Dr. L. H. Smith, Oak Ridge National 

 Laboratory, Oak Ridge, Tennessee. 

 Dr. Willys Silvers, The Wistar Institute, 

 Philadelphia 4, Pennsylvania. 

 Dr. Roy L. Walford, Department of 

 Pathology, Medical Center, University 

 of California, Los Angeles, California. 

 Dr. W. C. Young, Department of 

 Anatomy, University of Kansas, Law- 

 rence, Kansas. 



