PIN4 (PIN-FORMED 4); auxin:hydrogen symporter/ transporter. Identical to Auxin efflux carrier component 4 (PIN4) [Arabidopsis Thaliana] (GB:Q8RWZ6;GB:Q9M7Q6;GB:Q9MAS3); similar to PIN3 (PIN-FORMED 3), auxin:hydrogen symporter/ transporter [Arabidopsis thaliana] (TAIR:AT1G70940.1); similar to PIN7 (PIN-FORMED 7) [Arabidopsis thaliana] (TAIR:AT1G23080.3); similar to PIN7 (PIN-FORMED 7), auxin:hydrogen symporter/ transporter [Arabidopsis thaliana] (TAIR:AT1G23080.1); similar to efflux carrier, pin2 [Brassica juncea] (GB:CAC67457.1); similar to efflux carrier of polar auxin transport [Brassica juncea] (GB:CAC24691.1); similar to efflux carrier,