Western blot analysis of HS1 in escapees. (A) MoAb AHS1. (B) RbAHS1. Lanes were loaded with equal amounts of cell lysates prepared from the same number of cells. Lane 1, 10% BCL₁ cells plus 90% normal splenocytes. Lane 2, wild-type-BCL₁ tumor. Lane 3, escapee no. 3. Lane 4, escapee no. 6.