▁is ▁local ised ▁to ▁the ▁pl asma ▁memb rane ▁of ▁cells ▁whilst ▁ves icular ▁gl ut am ate ▁trans por ters ▁( V GL UT s ) ▁are ▁found ▁in ▁the ▁memb rane ▁of ▁gl ut am ate - cont aining ▁syn apt ic ▁ves icles . ▁Na + - dependent ▁E A AT s ▁are ▁also ▁dependent ▁on ▁transm emb rane ▁K + ▁and ▁H + con cent r ation ▁grad ients , ▁and ▁so ▁are ▁also ▁known ▁as ▁' s od ium ▁and ▁pot ass ium ▁couple d ▁gl ut am ate ▁trans por ters '. ▁Na + - dependent ▁trans por ters ▁have ▁also ▁been ▁called ▁' high - aff inity ▁gl ut am ate ▁trans por ters ', ▁though ▁their ▁gl ut am ate ▁aff inity ▁actually ▁var ies ▁widely . ▁E A AT s ▁are ▁ant ip or ters ▁which ▁carry ▁one ▁mole c ule ▁of ▁gl ut am ate ▁in ▁along ▁with ▁three ▁Na + ▁and ▁one ▁H + , ▁while ▁export ▁one ▁K + . ▁E A AT s ▁are ▁transm emb rane ▁integral ▁prote ins ▁which ▁traverse ▁the ▁pl asma lemma ▁ 8 ▁times . ▁ ▁M ito ch ond ria ▁also ▁possess ▁mechan isms ▁for ▁taking ▁up ▁gl ut am ate ▁that ▁are ▁quite ▁distinct ▁from ▁memb rane ▁gl ut am ate ▁trans por ters . ▁ ▁E A AT s ▁ ▁In ▁humans ▁( as ▁well ▁as ▁in ▁rod ents ), ▁five ▁sub types ▁have ▁been ▁identified ▁and ▁named ▁E A AT 1