GCA_000018585.1 P9211_03141 definition Protoporphyrin IX Magnesium chelatase, ChlD subunit GCA_000018585.1 P9211_09361 definition protoporphyrin IX magnesium chelatase, subunit chlH GCA_000018585.1 P9211_11361 definition Protoporphyrin IX Magnesium chelatase, ChlI subunit GCA_000018585.1 P9211_17571 definition MgtE family, putative magnesium transport protein