english: It's not like your heart cells and kidney cells get all mixed up every day, and that's because there's all of this chemistry going on, these molecules that say who each of these groups of cells is and what their tasks should be.
non_english: Celice vašega srca in ledvic se ne mešajo med sabo, saj jim na kemični način molekule povejo, kdo spada h kateri skupini celic in kaj je njihova naloga.