MLC1 and neoplasm: Two representative clones, 4G7VL-VH-GGGGS-hu38E4.v1VH-VL (Clone 5) and 4G7VL-VH-AEAAAKA-L2KVH-VL (Clone 6) with a short flexible and a rigid linker, respectively, were further characterized using a primary T cell and Raji coculture assay (Fig.6a–d) and functionally validated for tumor killing with an efficiency comparable to recombinant Blinatumomab (Fig. 6e).