DIFFERENCES IN NUMBER AND DISTRIBUTION OF STRIATAL CALBINDIN MEDIUM SPINY NEURONS BETWEEN A VOCAL-LEARNER (MELOPSITTACUS UNDULATUS) AND A NON-VOCAL LEARNER BIRD (COLINUS VIRGINIANUS)

Striatal projecting neurons, known as medium spiny neurons (MSNs), segregate into two compartments called matrix and striosome in the mammalian striatum.The matrix domain is characterized by the presence of calbindin immunopositive (CB+) MSNs, not observed in the striosome subdivision.The existence of a similar CB+ MSN population has recently been

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