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5.B.10.1.1
The ferric iron reductase, VciB, of 225 aas and 3 TMSs,  Electrons from the electron transport chain are transferred to this transmembrane reductase which then reduces periplasmic Fe3+ to Fe2+ (Peng and Payne 2017).

Accession Number:Q9KV73
Protein Name:Uncharacterized protein
Length:225
Molecular Weight:25331.00
Species:Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961) [243277]
Number of TMSs:3
Substrate iron(3+)

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence
1:	MQRQVKGDNH RRAGLTASLI MQRRRLPLHN NKWIRRLHAW CGFFTLLLML LYGLTGLWLS 
61:	HRAVWPLPGP HTSKSEWQLS LTEPIDSVST FQAQLNTEYG EHEWTIREIA AQQLPTPQQP 
121:	LLIPARWEAR ATSVTDTFSA QYVPGTLVIQ AQHQKANWAA VLNRLHRGMG TGLGWQLFSD 
181:	LAAVAMLLLA LTSLLMWTKL HGSPKRAGWL LIGGSVATTL FAIFG