Instruments signed for accommodation, §11-3-419. Joint and several liability, §11-3-116. Obligation of acceptor, §11-3-413. Obligation of drawer, §11-3-414. Obligation of indorser, §11-3-415. Obligation of issuer of negotiable instrument, §11-3-412. Payment by mistake, §11-3-418. Presentment warranties, §11-3-417. Refusal to pay. Negotiable instrument, §11-3-411. Signature, §11-3-401. Forged instrument. Negligence contributing to, §11-3-406. COMMERCIAL CODE —Cont’d Negotiable instruments —Cont’d Liability of parties —Cont’d Signature —Cont’d Representative signature, §11-3-402. Unauthorized signature, §11-3-403. Transfer warranties, §11-3-416.