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The UCC's definition of 'signed' includes 'any symbol executed or adopted by a party with present intention to authenticate a writing.' Mo. Rev. Stat. 400.2-201(39). The Comment to the UCC's definition states: The inclusion of authentication in the definition of 'signed' is to make clear that as the term is used in this Act a complete signature is not necessary. Authentication may be printed, stamped or written; it may be by initials or by thumbprint. It may be on any part of the document and in appropriate cases may be found in a billhead or letterhead. No catalog of possible authentications can be complete ...