Glutamic acid
Glutamate is also a neurotransmitter (see below), which makes it one of the most abundant molecules in the brain. Malignant brain tumors known as glioma or glioblastoma exploit this phenomenon by using glutamate as an energy source, especially when these tumors become more dependent on glutamate due to mutations in the gene "IDH1".
GABA transporter
GABA transporter group consists of six different transporters:GAT1 and GAT3 are the major GABA transporters in the brain and spinal cord, expressed by both neurons and some astrocytes. GAT2 and BGT1 are also expressed in the brain, but at low levels and mostly in the meninges. GAT2 also transports taurine, while BGT1 transports betaine. These two transporters are predominantly expressed in the liver, but are also found in the kidneys and, as mentioned above, in the meninges.