Figure 3.

A model of spliceosome assembly (A) in the absence of HDACs, where Clk and other kinases (not shown) phosphorylate SR proteins, enabling them to bind to exonic splicing enhancers (ESEs), triggering a cascade of proteins to form the major spliceosome. (B) In the presence of HDACs, Clks are unable to phosphorylate SR proteins, inhibiting spliceosomal assembly.