Purinergic receptor P2X 4 MAGCCAALAA FLFEYDTPRI VLIRSRKVGL MNRAVQLLIL AYVIGWVFVW EKGYQETDSV VSSVTTKVKG VAVTNTSKLG FRIWDVADYV IPAQEENSLF VMTNVILTMN QTQGLCPEIP DATTVCKSDA SCTAGSAGTH SNAWHHPG