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We obtained well-differentiated staining of thalamic subdivisions in rhesus macaques and squirrel monkeys using a lectin, Wisteria floribunda agglutinin (WFA), that labels extracellular matrix proteoglycans. Regional variations in staining were observed within the motor and somatosensory thalamic regions that bear on current interpretations of the organization of these regions. The pattern of WFA staining was generally similar to that obtained with Cat-301 antibody, which also stains proteoglycans. However, WFA reliably produced selective staining in both squirrel monkeys and macaques, whereas Cat-301 stained macaques more consistently than squirrel monkeys.

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