Fig. 4From: Development of a human phage display-derived anti-PD-1 scFv antibody: an attractive tool for immune checkpoint therapyThe expression of soluble scFv fragment in Rosetta-Gami 2 was evaluated by SDS–PAGE (a) and Western blot analysis (b). M: protein marker; Lane 1: total lysate from non-induced E. coli Rosetta-Gami 2 as negative control; Lane 2: SS107 scFv; The molecular weight of SS107 scFv was about 28 kDaBack to article page