We induced ciBECs with two hiPSC lines, 201B6 and 836B3. Furthermore, we performed the chimera differentiation assay, in which 836B3 iPSC-derived ECs and pericytes were co-cultured with 201B6 iPSC-derived neurons and astrocytes. This method also was able to generate ciBECs (Figure S3). These results indicated that our method is robust for generating ciBECs.