2.1.1.163 expression in Escherichia coli 2.1.1.163 gene dmtH, cloned from a transposon-inserted mutant library, DNA and mino acid sequence determination and analysis. Real-time quantitative PCR shows that dmtH is a bacteroid-specific gene with highest expression at 25 days after inoculation of strain 7653R 2.1.1.163 gene heps-2, DNA and amino acid sequence determination and analysis, overexpression in Escherichia coli strain JM109