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Schematic representation of biochemical pathways by using Mts1 and Mts2 proteins. Upstream signals converge via the mitogen-activated protein (MAP) kinase cascade (19, 20) and likely via Pat1 and Pka kinases (16–20). Signals diverge at Mts1 and Mts2 to activate the appropriate developmental responses. Some effector functions require Mts1, some require Mts2, and some require both Mts1 and Mts2.
