Sorrento Therapeutics (NSDQ:SRNE) has received the go-ahead from the Brazilian Health Regulatory Agency (ANVISA) for a Phase 2a study involving its COVI-MSC allogeneic adipose-derived mesenchymal stromal cells. The company hopes the experimental treatment will benefit patients with so-called “long COVID,” a syndrome linked with a variety of symptoms ranging from fatigue to pulmonary compromise. The…