id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
ddj-144	Pitkanen, Matti	New Support for the View on Cambrian Explosion Being Caused by Rapid Increase of Earth Radius	2018	5	.pdf	application/pdf	2906	153	46	Stem cells to not however tolerate oxygen. The proposal of the authors is that the evolution of the capacity to maintain stem cells even in an oxic environment allowed the animals to keep stocks of stem cells needed for tissue growth and repair for that this required at gene level new genes coding for so called HIFs.	cache/ddj-144.pdf	txt/ddj-144.txt