Raising $94 million in a series A round, South San Francisco-based Firefly Bio Inc. has emerged from stealth to advance its Firelink linker platform technology to develop degrader-antibody conjugates (DACs) to treat cancer. A combination of antibody-drug conjugates (ADCs) and targeted protein degradation therapies, DACs are a new class of medicines that have recently gained attention for their ability to replace toxic ADC payloads and to eliminate cancer-driven proteins.