However , several complete genome sequences later became available for such bacteria .
Novel biochemical reactions were discovered , enabling the respective metabolic pathways , but progress in the molecular understanding of these bacteria was slowed by the absence of genetic systems for most of them .
Several complete genome sequences later became available for such bacteria .
Novel biochemical reactions were discovered , enabling the respective metabolic pathways , but progress in the molecular understanding of these bacteria was slowed by the absence of genetic systems for most of them .