hESCs (H9 from WiCell, Maddison, WI, USA) and hIPSCs (BBHX8, A1ATD-1, JRO1D; University of Cambridge, Cambridge, UK) [16 (link)] were passaged weekly using collagenase IV and maintained in chemically defined medium (CDM) supplemented with activin A (10 ng/ml) and FGF2 (12 ng/ml), as described previously [17 (link)]. Differentiation was carried out as described in Fig. 1 and is explained in detail in the electronic supplementary material (ESM) Methods.

Protocols to generate hepatic and pancreatic endoderm from hESCs and hIPSCs. Successive culture conditions driving differentiation of pluripotent stem cells towards pancreatic endoderm and hepatic endoderm. A, activin; ADV, advanced DMEM; B, BMP; CMRL, Connaught Medical Research Laboratories medium; CYCP, cytochrome P450; DAPT, N-(N-[3,5-diflurophenylacetyl]-l-alanyl)-S-phenylglycine t-butyl ester; F, FGF; HGF, hepatocyte growth factor; Ly, LY294002; Nog, noggin; OSM, oncostatin M