Table 1.

Spontaneous mutant frequencies in whole fish, liver, and testes for lineage λ310

Tissue	No. fish	Total mutants	Total pfu	Mean pfu	Mean mutants × 10−5pfu ± SEM
Whole fish	6	395	13,691,667	2,281,945	2.9 (0.3)
Testes	5	139	8,508,333	1,701,667	1.8 (0.3)
Liver	11	405	9,148,333	831,667	4.3 (0.6)