The deoxyribonucleic acid (DNA) base composition of several strains of the psychrophobic species , and was found to be similar, DNA/DNA hybridization experiments by means of the nitrocellulose filter technique revealed high degrees of homology between the nuclear DNAs of all four species. On the basis of these findings, is considered to be a synonym of , which has certain distinct and reproducible properties, was reclassified as var. has been retained as a separate species because its guanine plus cytosine value is higher than that of the four species mentioned above and it has other distinct properties. The nonpsychrophobic species was included for comparison. The guanosine plus cytosine content of its DNA was approximately 7% higher than that of


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