the optic tecta of surgically produced three-eyed tadpoles were chronically exposed to the n-methyl-d-aspartate ( nmda ) receptor antagonist aminophosphonovaleric acid ( apv ) , or to nmda itself , to assess the influence of nmda receptor/channels on the eye-specific segregation of retinal ganglion cell ( rgc ) terminals that occurs whenever two retinas innervate one tectal lobe .
C0228405
optic tecta
C0039433
tectal