1. Sanofi collaborates with Dren Bio on a B-cell depleting therapy. 2. SNY shares currently face downward pressure amid ongoing market conditions. 3. Dren Bio to receive $100 million upfront, potentially $1.7 billion in total. 4. DR-0201 (SAR448501) shows promise in treating autoimmune diseases. 5. Sanofi will manage development and commercialization post-candidate selection.