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P or trefoil or TFF domain; Trefoil factor family domain peptides are mucin-associated molecules, largely found in epithelia of gastrointestinal tissues. Function is not known but it was originally identified from mucosal tissues, where it may have a regulatory or structural role and has also been implicated as a growth fractor in other tissues.The domain is found in 1 to 6 copies where it occurs.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",