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: Vaše srdcové bunky sa nemiešajú s vašimi obličkovými bunkami, a to práve vďaka celej tejto chémii, vďaka molekulám, ktoré určia ktorá skupina buniek je ktorá a aká je ich úloha.