▁V GL UT s . ▁ ▁This ▁process ▁is ▁named ▁the ▁gl ut am ate – gl ut am ine ▁cycle . ▁ ▁V GL UT s ▁Three ▁types ▁of ▁ves icular ▁gl ut am ate ▁trans por ters ▁are ▁known , ▁V GL UT s ▁ 1 – 3 ▁( S LC 1 7 A 7 , ▁S LC 1 7 A 6 , ▁and ▁S LC 1 7 A 8 ▁respectively ) ▁and ▁the ▁novel ▁gl ut am ate / as part ate ▁trans porter ▁s ial in . ▁These ▁trans por ters ▁pack ▁the ▁ne uro trans mit ter ▁into ▁syn apt ic ▁ves icles ▁so ▁that ▁they ▁can ▁be ▁released ▁into ▁the ▁syn ap se . ▁V GL UT s ▁are ▁dependent ▁on ▁the ▁pro ton ▁gradient ▁that ▁exists ▁in ▁the ▁secret ory ▁system ▁( ves icles ▁being ▁more ▁acid ic ▁than ▁the ▁c yt os ol ). ▁V GL UT s ▁have ▁only ▁between ▁one ▁hundred th ▁and ▁one ▁thousand th ▁the ▁aff inity ▁for ▁gl ut am ate ▁that ▁E A AT s ▁have . ▁ ▁Also ▁unlike ▁E A AT s , ▁they ▁do ▁not ▁appear ▁to ▁transport ▁as part ate . ▁ ▁V G lu T 3 ▁▁ ▁V G lu T 3 ▁( V es icular ▁Gl ut am ate ▁Trans porter ▁ 3 ) ▁that ▁is ▁encoded ▁by ▁the ▁S LC 1 7 A 8 ▁gene ▁is ▁a ▁member ▁of ▁the ▁ves icular ▁gl ut am ate ▁trans porter ▁family ▁that ▁trans ports