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1.A.102.1.1
The PB1-F2 protein of 90 aas, and possibly a weakly hydrophobic C-terminal TMS, exhibits viroporin activity, transporting monovalent cations and Ca2+ (Hyser and Estes 2015).

Accession Number:A4GCL7
Protein Name:Protein PB1-F2
Length:90
Molecular Weight:10737.00
Species:Influenza A virus (strain A/USA:Iowa/1943 H1N1) [425563]
Location1 / Topology2 / Orientation3: Host mitochondrion inner membrane1
Substrate calcium(2+)

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence
1:	MGQEQDTPWI LSTGHISTQK GEGGQQTPKL EHHNSTRLMG HCQKTMNQVV MPKQIVYWKQ 
61:	WLSLRNPILV FLKTRVLRRW RLFSKHEWTN