Do any of the commercial sources (BBL,Difco,?) make a selective agar plate which has pyrizinamide so that one may select for pyrizinamidase negative organisms? -- ---------- Terry Gritton "Glycobiology - one of the last great" TGritton at eworld.com "frontiers of biochemistry/bioinformatics" grbr at arapaho.cse.ucsc.edu