NEW YORK, July 23, 2021 (GLOBE NEWSWIRE) — Protagenic Therapeutics, Inc. (Nasdaq: PTIX) a biopharmaceutical company focused on developing therapies to treat stress-related neurologic disorders, today announced that upon reviewing its investigational new drug (IND) application filed on June 29th, the U.S. Food and Drug Administration (FDA) has requested that Protagenic provide clinical sites with ready-to-inject clinical vials rather than providing site pharmacies with drug substance to be formulated locally.