Additional Relevant Details In vitro studies have shown that the combination of these novel PD-1 mAbs with currently approved anti-PD-1 mAbs enhances the recovery of T-cells from exhaustion. Due to their new mechanism of action, these anti-PD-1 mAbs may be used in combination with other PD-1/PD-L1 inhibitors, such as Nivolumab and Pembrolizumab, or other checkpoints inhibitors and immunotherapy approaches for boosting the therapeutic effects of single therapy. Furthermore, this novel class of anti-PD-1 mAbs may represent an alternative and effective therapeutic intervention in those cancer patients with tumors expressing low levels of PD-L1, with respect to the currently approved anti-PD-1 mAbs. In addition, Cellectis intend to combine these PD-1 mAbs with its gene-edited UCART product candidates to enhance their activity and increase their half-life.The agreement includes a collaboration phase funded by Cellectis whereby Cellectis and MabQuest will jointly pursue preclinical research on several candidate antibodies; and a clinical development and commercialization phase of the best selected antibodies which will be led by Cellectis.Under the agreement, MabQuest has granted an exclusive option to Cellectis. Upon exercise of the option, Cellectis would be granted worldwide exclusive rights over the family of PD-1 antagonist antibodies developed under the collaboration for all fields, and further potential derivatives of these antibodies.