Proposal forNumbering Mutants ofAvianLeukosis and SarcomaViruses

i.e., laboratory code letter andmutantnumber; both should always be usedto refer toa mutant. The designations in the left-handcolumn of the table contain additionalinformation, such as mutant category,wild-type strain, and subgroup, which maybeimportant in the context of a particularexperiment. The inclusion of this additionalinformation in the mutant designation isoptional; however, this information should begiven in the Materials andMethodssection.The following investigators have