Minn. Stat. § 544.21: INCORPORATION, PLEADING AND PROOF.

In actions by or against a corporation, domestic or foreign, it shall be a sufficient averment of its incorporation to allege, in substance, that the party is a corporation duly organized and existing under the laws of the designated state, country, or place. Unless the adverse party shall specifically aver that the plaintiff or defendant is not a corporation, no proof thereof shall be required at the trial.