Johnson & Johnson said it will purchase the startup Firefly Bio for $1 billion in an effort to expand its work in the suddenly buzzy field of KRAS inhibitors.

The buyout hands J&J a technology that merges elements of two popular drugmaking methods: protein degraders and antibody-drug conjugates.

Johnson & Johnson to Acquire Firefly Bio, Inc. to Expand Oncology Pipeline with Novel Degrader Antibody Conjugate Platform