As a scaffold for building [problem to be solved] large of regenerating tissue, (1) has a high affinity for cells, (2) the structure is stable even under physiological environment, (3) promptly raw after transplantation decomposed body (4) can be internal to stably supported without leaking vascular inducing factor, (5) it has transparency to the extent that can be observed over time the state of cells cultured within the gel, ( 6) the strength of the resulting gel is to provide a material having both characteristics can be easily adjusted. A oligosaccharide oxide having an aldehyde group, and a crosslinkable composition comprising a polypeptide or a polysaccharide having an amino group in the side chain. .BACKGROUND【解決課題】大型の再生組織を構築するためのスキャホールドとして、(1)高い細胞親和性をもち、(2)生理環境下でも構造が安定で、(3)移植後に速やかに生体内分解し、(4)血管誘導因子を漏洩することなく内部に安定に担持でき、(5)ゲル内部で培養している細胞の状態を経時的に観察できる程度の透明性を有し、(6)得られるゲルの強度を容易に調整できる特徴を兼備した材料を提供すること。【解決手段】アルデヒド基を有するオリゴ糖酸化物、及び側鎖にアミノ基を有するポリペプチド又は多糖類を含む架橋性組成物。【選択図】なし
