INTERNATIONAL RULES OF NOMENCLATURE 521 



He f /Ha (C3H/He fostered by Heston, currently maintained by Hauschka) ; CBA/ 

 Ca-^/Gn (Carter's substrain of CBA with mutation to se, maintained by Green). 

 Since a single symbol in this position (for example, the De in DBA/2eBDe) may refer 

 either to the person producing or the person maintaining the strain, the intended mean- 

 ing should be clearly recorded. 



8. Indication of inbreeding. — Where it is desired to indicate the number of generations 

 of inbreeding b x s, this shall be done by appending, in parentheses, an F followed by 

 the number of inbred generations. Example: A(F87). If, because of incomplete 

 information, the number given represents only parts of the total inbreeding, this should 

 be indicated by preceding it with a question mark and plus sign. Example: YBL 

 (F? + 10). 



9. Priority in strain symbols. — If two inbred strains are assigned the same symbol, 

 the symbol to be retained shall be determined by priority in publication. For this 

 purpose, listing in Mouse News Letter or Inbred Strains of Mice shall be regarded 

 as publication. 



