OXIS International Inc. (GTBP) Moves to Buy: Rationale Behind the Upgrade Posted byZacks Equity Research September 16, 2021 Leave a comment on OXIS International Inc. (GTBP) Moves to Buy: Rationale Behind the Upgrade OXIS International Inc. (GTBP) might move higher on growing optimism about its earnings prospects, which is reflected by its upgrade to a Zacks Rank #…