establishment of localization response to chemical establishment of localization response to chemical establishment of localization response to chemical establishment of localization response to chemical establishment of localization response to chemical establishment of localization response to chemical establishment of localization response to chemical establishment of localization response to chemical establishment of localization response to chemical establishment of localization response to chemical establishment of localizationestablishment of localization response to chemicalresponse to chemical transmembrane transporter activity neurotransmitter transporter activity transmembrane transporter activity neurotransmitter transporter activity transmembrane transporter activity neurotransmitter transporter activity transmembrane transporter activity neurotransmitter transporter activity transmembrane transporter activity neurotransmitter transporter activity transmembrane transporter activity neurotransmitter transporter activity transmembrane transporter activity neurotransmitter transporter activity transmembrane transporter activity neurotransmitter transporter activity transmembrane transporter activity neurotransmitter transporter activity transmembrane transporter activity neurotransmitter transporter activity transmembrane transporter activitytransmembrane transporter activity neurotransmitter transporter activityneurotransmitter transporter activity cell membrane cell membrane cell membrane cell membrane cell membrane cell membrane cell membrane cell membrane cell membrane cell membrane cellcell membranemembrane