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PII PII. Nif operon I (Dhaf_1047-1058). nifH D K E N X B X. NO 3 -. Nif operon II (Dhaf_1351-1360). ABC transporter, nitrate/sulfonate/bicarbonate. vnfH vnfN vnfE. Nif operon III (Dhaf_1537-1545).
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PII PII Nif operon I (Dhaf_1047-1058) nifH D K E N X B X NO3- Nif operon II (Dhaf_1351-1360) ABC transporter, nitrate/sulfonate/bicarbonate vnfH vnfN vnfE Nif operon III (Dhaf_1537-1545) moeA moeA nifH nifEN or nifDK ABC transporter Fe3+ siderophore transport O2 Nif operon IV (Dhaf_1809-1818) araC-like ABC transporter nifH nifE nifN