PROBLEM TO BE SOLVED: To provide a XTEN conjugate composition and a method for fabricating the composition.SOLUTION: A method for producing a composition including a substantially homogeneous population of a XTEN sequence includes: a. providing a composition containing at least one polypeptide having an amino acid sequence which is an amino acid sequence selected from the group of specific sequences, and includes at least one cleavage sequence; and b. treating the polypeptide composition by trypsin under a condition effective for cleaving the cleavage sequence, in which at least 95%, 96%, 97%, 98% or 99% of an individual sequence in a substantially homogeneous population of the obtained XTEN sequence has the same sequence length .SELECTED DRAWING: Figure 1COPYRIGHT: (C)2020,JPO&INPIT【課題】XTEN共役組成物およびそれを製造する方法の提供。【解決手段】XTEN配列の実質的に均質な集団を含む組成物を産生する方法であって、a.特定の配列の群から選択されるアミノ酸配列であって、少なくとも1つの切断配列を含む、アミノ酸配列を有する少なくとも1つのポリペプチドを含む組成物を提供することと、b.前記ポリペプチド組成物を、前記切断配列を切断するのに有効な条件下で、トリプシンで処置することと、を含み、得られたXTEN配列の実質的に均質な集団中の個別の配列の少なくとも95%、96%、97%、98%、または99%が、同一配列長を有する、方法。【選択図】図1