I am looking for a protocol to do the regular CAT assay using C14 chloramphenicol and tlc paper or plates that involves assaying e. coli extracts and not mamalian extracts as many protocols describe. -- Albert Crescenzo Yale University Dept. MB&B, Bass Rm 233 266 Whitney Ave. New Haven CT, 06520 203 432-6206 e-mail atc at trna.chem.yale.edu