SUMMARY: A series of genomic DNA fragments that encode gonococcal pilins from four well-characterized pilus variants of strain P9 have been cloned in K12. At least nine classes of cloned P9 pilin genes have been identified on the basis of restriction mapping of cloned pilin-encoding DNA and physical and immunological analysis of expressed pilin proteins. Each antigenic variant of strain P9 possesses many genomic segments of pilin gene information, although our results suggest that strain P9 contains only a single pilin-expressing () locus.


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