Congrats to Tatyana Grinenko and Ben Wielockx from Dresden, Germany! The collaboration we initiated around 2 years ago, using the Ki67-RFP mouse line to identify and purify dividing blood stem cells, is now a part of the recent Nature Communications article “Hematopoietic stem cells can differentiate into restricted myeloid progenitors before cell division in mice” (https://rdcu.be/ONi2).