tokens: The MMA , DMA , and TMA methyltransferases are not homologs ; however , like the MMA methyltransferase gene , the genes encoding the DMA and TMA methyltransferases each contain a single in-frame amber codon .
folded_tokens: the MMA , DMA , and tma methyltransferase be not homolog ; however , like the MMA methyltransferase gene , the gene encode the dma and tma methyltransferase each contain a single in-frame amber codon .