Membrane spanning 4-domains A4E MTTMQGMEQT TPGAGPDVPQ LGNIDVIHSY LCKGLQEKFF KRKPKVLGVL CGHKFSTHSV SLSVAAGIRT TKGLVGGSLG KNITSSVLAI SGILINAISL TFYSFRYHYC NHDQLSSNCY MTMSILMGTD GMVLLLSVLE FCIAVALSAF GCKVLCCSPS ESKNKIRSNT FMCYLLSIQM QYDGKRLNVD VDSTVWCSGD GQYLEKVYYD ILSSWLRIES IYRVLNGAQA GVQWRDLGSL QPPPPSRLPW PPKVPRVQPL PGRHPVWEVR SVSAWPPIVW DVRSPSAWLP SLESEERLCP AAIPSRKWGA PLPGHHPIWE VRSVSARPPI F