MSCs in regenerative medicine: A perspective.- MSCs: Changing hypotheses, paradigms, and controversies on mechanisms of action in repairing tissues.- MSCs: the need to rethink.- Characterization of MSCs: From early studies to the present.- MSCs as therapeutics.- MSC niche for hematopoiesis.- Immunomodulatory properties of MSCs.- MSCs and the innate immune system: A balancing act.- MSCs: paracrine effects.- Cross-talk between MSCs and their environments.-...