Question: what are ampa receptors permeable to?
Answer: α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors are the main excitatory neurotransmitter receptors in the brain. ... It has been found that GluA2 subunit-lacking AMPA receptors are permeable to Ca2+ ions (calcium permeable AMPA, CP-AMPA).