Given the task definition and input, reply with output. In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.

 By representative difference analysis we found that CRABP II is also strongly expressed in human monocyte - derived macrophages ( MAC ) but not in freshly isolated monocytes ( MO ) .

CRABP II