After recording, retinas were fixed (4% paraformaldehyde, 30 min, 20°C) and counterstained with one or more antibodies: (1) rabbit anti-cocaine and amphetamine-regulated transcript (CART; 1:1000; H00362, Phoenix Pharmaceuticals), a specific marker for most ON-OFF DS cells; Kay et al., 2011 (link)); (2) guinea pig anti-RNA-binding protein with multiple splicing (RBPMS; 1:1000; 1832-RBPMS, PhosphoSolutions), a pan-ganglion-cell marker; Rodriguez et al., 2014 (link)); (3) goat anti-ChAT (1:100, anti-ChAT; AB144P, Millipore); (4) rat anti-mCherry (1:1000, EST202, Kerafast); or (5) rabbit anti-melanopsin (1:1000, Advanced Targeting Systems).
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