CRP and acute respiratory distress syndrome: For instance, about pcMSC transplantation, a clinical study showed that if COVID-19 patients received (200 ± 20) × 105 stem cells on Day 0 and Day 4 in a course of treatment, the symptoms associated with ALI was greatly alleviated, including much lower mortality, higher PaO2/FiO2 ratio and lower lactate dehydrogenase (LDH) and C-reactive protein (CRP) level.