The histone-binding protein cooperator of PRMT5 (COPRS) guides PRMT5:WDR77 to methylate histone H4 arginine-4 (H4R3) rather than histone H3 arginine-9 (H3R8) (Lacroix et al. 2008).
Rodier, G, Le Cam, A, Fabbrizio, E, Sardet, C, El Messaoudi, S, Lacroix, M
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