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1.G.9.1.3
Syncytin-B of 618 aas with several TMSs, possibly as many as 6, with one N-terminal, one C-terminal, and 4 internal at residues 120, 170, 360 and 440.  PiT1/SLC20A1 is the receptor for the endogenous retroviral envelope syncytin-B involved in mouse placenta formation (Mousseau et al. 2024).

Accession Number:NP_775596.1
Protein Name:NP_775596.1 syncytin-B precursor [Mus musculus]
Length:619
Molecular Weight:
Species:Mus musculus [10090]
Number of TMSs:3
Substrate

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence
1:	MTGFWVLCFV LFPSSLSYPE SWMPLVNLTH HILRDTNSSL FSNCWVCLST QTQRSLAVPA 
61:	PLSIWTDTPM KLHLTYSVRP FSGSFSISDI ERRLRLFRPL TASYSFHNPD RRAIAFLQLV 
121:	SSTGIFRIIT RITSVIYPHK DRFFESAQRP LWGPLFTETV LRSQAPLCIS RFFKVSAYAT 
181:	FVGNLSASLC NYTMHISPST SHENLDLSTT HTFKQAMKRP DAKWKNPLRF SGPPSLIFSK 
241:	PAYYPCPTDI KHCHTSPATP WMHCPQAPFG TCYNLTLFEP DNSTHPVTMS VNPTHFKVKL 
301:	QGHRDPYPLS HYQPLTGAAL SGQYSVWENE ITVQENWDIT SNIFSHLLSF SYAFCLNSSG 
361:	VFFLCGTSTY ICLPANWSGV CTLVFQYPDI ELLPNNQTVP VPLFASVLSS DSVLRPKRSP 
421:	HLFPFLAGLG ISSALGTGIA GLATSTLYFQ QLSKVLSETL EEIAASITTL QNQIDSLAGV 
481:	VLQNRRALDL ITAEKGGTCL FLQEECCFYV NQSGIVRDAA RKLQERASEL GQHSDSWGQW 
541:	PDLGRWLPWL TPFLGPLLFL FFLLTFGSCL LNCLTRFVSQ RLGSFVQDTA KRHVDSILQN 
601:	FQYKKLPQDS PDEDTIPT