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We prove that the Zarisky closure of the monodromy group of the polynomial $x^2 y^2(1-x-y) $ is the symplectic group $Sp(4,\mathbb C)$. This shows thatsome previous results about this monodromy representation are wrong.

Irreducibility of the Picard-Fuchs equation related to the Lotka-Volterra polynomial $ x^2 y^2(1-x-y) $