PROBLEM TO BE SOLVED: To provide a composition for improving the brain function.SOLUTION: The peptide contains X-Pro-Pro-Leu-Thr-Gln-Thr-Pro-Val-Val-Val-Pro-Pro-Phe-Leu-Gln-Pro-Glu-Y (wherein (i) X represents Asn-Ile and Y is nil or represents Val-Met or (ii) X is nil or represents Ile and Y is nil) or the peptide contains X-Val-Val-Val-Pro-Pro-Phe-Leu-Gln-Pro-Glu (wherein X is nil or represents Leu-Thr-Gln-Thr-Pro or Pro) or a salt of the same.COPYRIGHT: (C)2012,JPO&INPIT【課題】脳機能を改善するペプチドを提供する。【解決手段】X-Pro-Pro-Leu-Thr-Gln-Thr-Pro-Val-Val-Val-Pro-Pro-Phe-Leu-Gln-Pro-Glu-Y(式中、i)XはAsn-Ileであり、Yは存在しないかVal-Metを表す、または、ii)Xは存在しないかIleを表し、Yは存在しない)からなるペプチド、または、X-Val-Val-Val-Pro-Pro-Phe-Leu-Gln-Pro-Glu(式中Xは存在しないか、Leu-Thr-Gln-Thr-ProまたはProのいずれかを表す)からなるペプチド、またはそれらの塩。【選択図】なし
