An overview of all lines is present in Table S4 (Online Resource 17). The CV-B iPSC-line has been described previously [18 (link)]. The study approval for Ctrl-1-SC11 was granted by the local ethics committee (No. 4485, FAU Erlangen-Nuernberg, Germany). IPSC were cultured on Matrigel coated dishes and fed all 24 h with mTesR1 (Stemcell Technologies). Upon reaching ~ 80% confluency, iPSC were passaged using Accutase in a 1:3–1:6 ratio. After passaging and thawing, mTesR1 was supplemented with 10 µM Y27632 (ROCK-inhibitor, RI, Tocris).