PROBLEM TO BE SOLVED: To provide isolated peptide and a peptide analog that have little or no potentially undesirable hematopoietic effect but have tissue protective activity in a responsive cell, tissue, or organ.SOLUTION: Isolated peptide or a peptide analog comprises a 9 to 29-residue amino acid sequence featuring a core structural motif selected from (1) two negatively charged amino acids and (2) one positively charged amino acid and one negatively charged amino acid. Core charged amino acids are flanked by 7 to 27 amino acids. The core charged amino acids are immediately adjacent to each other. In certain embodiments, the charged amino acids are separated by 1 to 5 amino acids or by a single polar amino acid.SELECTED DRAWING: Figure 1【課題】潜在的に望ましくない血液生成作用をほとんど又は全く有しない、応答性細胞、組織又は器官において組織保護活性を有する単離ペプチド及びペプチド類似体の提供。【解決手段】単離ペプチド又はペプチド類似体は、(1)2つの負荷電アミノ酸及び(2)1つの正荷電アミノ酸と1つの負荷電アミノ酸から選択される、コア構造モチーフを特徴とする9~29残基のアミノ酸配列を含む。コア荷電アミノ酸は、7~27アミノ酸に挟まれる。コア荷電アミノ酸は、互いに直接隣接している。また、荷電アミノ酸は、1~5個のアミノ酸によって、又は単一極性アミノ酸によって分離される。【選択図】図1