Alla Katsnelson | Feb 10, 2009 | 3 min read
Researchers have helped resolve a long-standing debate about which precursors in the developing mammalian embryo give rise to blood cells, after tracking the birth of these cells using in-vivo imaging that lasts for days, according to linkurl:a report;http://www.nature.com/nature/journal/v457/n7231/full/nature07760.html in this week's Nature. The study is one of a handful of papers to come out in recent months to examine the question of hematopoietic cell origin. "I would say the nice thing abo