GreenLight SPAC Presentation Deck

CBH % BW Change from Baseline (Day 0) MEAN ± SEM Percentage body weight change on viral challenge Healthy Promising Green Light influenza vaccine candidate High levels of antibody production and protection against viral challenge Sick 10- 0- -10- -20- -30- 0 1 T 2 Baseline Cut-off for euthanasia 3 4 5 6 Days Post Challenge 7 8 9 10 10ug GLB quadrivalent 2 doses 1ug GLB quadrivalent 2 doses 10ug GLB quadrivalent 1 dose Saline Full protection against morbidity from influenza challenge in mice, as evidenced by no loss of weight observed in vaccinated animals Investor Presentation | © 2021 GreenLight Biosciences. All rights reserved. GreenLight confidential. Percent Survival Survival post-challenge with virus 100 90- 80- 70- 60- 50- 40- 30- 20- 10- 0+ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Days Post Challenge GLB quadrivalent candidate GLB HA+NA candidate Saline Our vaccine candidates protect all mice from lethal influenza virus challenge HUMAN HEALTH 27

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