Collaboration revenue for the fourth quarter and full year in 2023 was $32 million and $36 million, respectively, compared to $1 million and $10 million for the same periods in 2022. The increase is mainly related to the clinical development milestone argenx achieved with AbbVie following the dosing of the first patient in the Phase 2 trial for ABBV-151. Collaboration revenue for full year in 2023 also includes $1 million in royalty revenue from VYVGART sales in China.