Meanings of intracellular symbionts in English

Conversely, the variable metabolism of obligate intracellular symbionts is enriched in anabolism.

The main reason is the very high specialisation of obligate intracellular symbionts, however, host-dependence alone is not an explanation for such absence.

While obligate intracellular symbionts have no core of reactions within their group, extracellular and cell-associated symbionts do have a small core composed of disconnected fragments.