§12A-3-308.

§12A-3-308.
   
           PROOF OF SIGNATURES AND STATUS AS HOLDER IN DUE COURSE
                                      
   (a) In an action with respect to an instrument, the authenticity of,
   and authority to make, each signature on the instrument is admitted
   unless specifically denied in the pleadings. If the validity of a
   signature is denied in the pleadings, the burden of establishing
   validity is on the person claiming validity, but the signature is
   presumed to be authentic and authorized unless the action is to
   enforce the liability of the purported signer and the signer is dead
   or incompetent at the time of trial of the issue of validity of the
   signature. If an action to enforce the instrument is brought against a
   person as the undisclosed principal of a person who signed the
   instrument as a party to the instrument, the plaintiff has the burden
   of establishing that the defendant is liable on the instrument as a
   represented person under subsection (a) of Section 65 of this act.
   
   (b) If the validity of signatures is admitted or proved and there is
   compliance with subsection (a) of this section, a plaintiff producing
   the instrument is entitled to payment if the plaintiff proves
   entitlement to enforce the instrument under Section 52 of this act,
   unless the defendant proves a defense or claim in recoupment. If a
   defense or claim in recoupment is proved, the right to payment of the
   plaintiff is subject to the defense or claim, except to the extent the
   plaintiff proves that the plaintiff has rights of a holder in due
   course which are not subject to the defense or claim.