pentapeptide

noun
pen·​ta·​pep·​tide | \ˌpen-tə-ˈpep-ˌtīd \

Definition of pentapeptide 

: a polypeptide that contains five amino acid residues

First Known Use of pentapeptide

1905, in the meaning defined above

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The first known use of pentapeptide was in 1905

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pentapeptide

noun
pen·​ta·​pep·​tide | \ˌpent-ə-ˈpep-ˌtīd \

Medical Definition of pentapeptide 

: a polypeptide that contains five amino acid residues

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