Deoxyribonucleic acid reassociation was used to determine relatedness among protei and providenciae and between these organisms and other members of the family . The results indicate the following. (i), and are homogeneous species. (ii) , and Prov. alcalifaciens each contain more than one deoxyribonucleic acid relatedness group. (iii) A group of urea-positive strains previously called biogroup 5 are, in fact, members of . (iv) is a valid species. (v) Protei are only distantly related to all other . Taxonomic revisions consistent with these observations are discussed. These include a proposal to place the currently recognized species of into one of three genera: The genus , containing Hauser, Hauser, and Cosenza and Podgwaite; a separate genus Fulton, for (Winslow et al.) Yale; and the genus containing (De Salles Gomes) Ewing, (Buttiaux et al.) Ewing, and comb, nov.


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