A 65-year-old woman who has a 12-year history of symmetrical polyahritis is admitted to the hospital. Physical examination reveals splenomegaly, ulcerations over the lateral malleoli, and synovitis of the wrists, shoulders, and knees. There is no hepatomegaly. Laboratory values demonstrate a white blood cell count of 2500/uL and a rheumatoid factor titer of 1:4096. This patient's white blood cell differential count is likely to reveal