This is because mamba toxin‐3 (MT3), a component of the venom of the East‐African green mamba (Dendroaspis angusticeps), is selective for mAChR M4 over all other mAChR subtypes in mammals,3 and it inhibits myopia in chicks and tree shrews at a much lower concentration than required by atropine (intravitreal injections of 10 μL of 2.5–10 μmol/L versus 20 μL of 10–100 mmol/L, respectively).4, 5. The gene discussed is MT3; the disease is myopia.