Meet the first authors: in a wonderful collaboration Igor and Dilyana, together with Thomas from Ingmar Glauche's "Theoretical Stem Cell Biology" group, developed endogenously tagged PCNA as an all-in-one cell cycle reporter for living cells to classify all cell cycle phases and quiescence using a single fluorescent channel. Furthermore, visualising the endogenous cyclin D1 in living cells, we showed that cyclin D1 maintains G1 phase and prevents the transition into quiescence. Have a look here to read the manuscript!