Global Stem Cell Assay Market By Type (Dermatology Stem Cell Assay, Cardiovascular Stem Cell Assay, Central Nervous System Stem Cell Assay, Oncology Stem Cell Assay, Other), By Application (Regenerative Medicine & Therapy Development, Drug Discovery and Development, Clinical Research, Other), By Region and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2019–2028