Bibliographical note© The Author(s), under exclusive licence to Springer Nature Limited 2019.
Funding: the Wellcome Trust (grant nos. 098051 and 206194) to the Sanger Institute and the University of Hong Kong internal funding (P. Liu); a Wellcome Trust Clinical PhD Fellowship for Academic Clinicians (D.J.R.); a PhD fellowship from the Portuguese Foundation for Science and Technology, FCT (grant no. SFRH/BD/84964/2012; L.A.); a Marie Sklodowska-Curie Individual Fellowship (M.A.E.-M.); the BBSRC (grant no. BB/K010867/1), Wellcome Trust (grant no. 095645/Z/11/Z), EU EpiGeneSys and BLUEPRINT (W.R.); a Chongqing Agriculture Development Grant (grant no. 17407 to L.P.G., Z.H.L. and Y.H.); REBIRTH project no. 9.1, Hannover Medical School (H.N.); Shuguang Planning of Shanghai Municipal Education Commission (grant no. 16SG14) and the National Key Research and Development Program (grant no. 2017YFA0104500; L. Lu); the China Postdoctoral Science Foundation (grant no. 2017M622795; D.C.); the Strategic Priority Research Program of CAS (grant nos. XDA16030503 and XDA16030501), the National Key Research and Development Program of China Stem Cell and Translational Research (grant no. 2017YFA0105103) and Key Research and Development Program of Guangzhou Regenerative Medicine and Health Guangdong Laboratory (grant no. 2018GZR110104004; L.Lai); the Shenzhen Municipal Government of China (DRC-SZ  884; Z.S.); the NHMRC of Australia (Senior Principal Research Fellowship grant no. 1110751; P.P.L.T.); the GRF of Hong Kong (grant nos 17119117 and 17107915) and the National Natural Science Foundation (grant nos. 81671579 (L. Lu), 31471398 (W.S.B.Y.) and U1804281 (Y. Zhang)).