HAIFA, Israel--(BUSINESS WIRE)--Pluristem Therapeutics Inc. (NasdaqCM: PSTI) (DAX: PJT) today announced that it has begun enrolling patients in the U.S. for a Phase I clinical trial with its unmatched placenta-derived stem cell product, PLX-PAD, the Company’s leading product candidate for the treatment of critical limb ischemia (CLI), the end-stage of peripheral artery disease (PAD).