http://www.almotamar.net صحيفة إلكترونية يومية تصدر عن حزب المؤتمر الشعبي العام (اليمن) http://www.almotamar.net/1615.htm 2006-11-23 Only two types of master cells are needed to build the heart, research teams here have found, apparently simplifying the challenge of using tissue engineering to repair congenital or acquired cardiac damage.