Acelyrin Inc. closed a $250 million series B round and, at the same time, unveiled a licensing deal with Affibody AB, involving an interleukin-17A (IL-17A) inhibitor, izokibep, which it is now testing in a pivotal trial in uveitis. Solna, Sweden-based Affibody is getting $25 million up front and could earn up to $280 million more in regulatory and sales-based milestones, as well as tiered royalties, ranging from high single digits to low double digits in percentage terms.