19800cell physiologyPT0000-00-00 00:00:00BT19275physiologyPTNT19987cell aggregationPTNT19988cell agingPTNT19989cell communicationPTNT19990cell compartmentationPTNT19801cell differentiationPTNT19991cell divisionPTNT19992cell fusionPTNT19998cell survivalPTRT19875cellsPT