CARF and lymphoma: Interestingly, we also observed an increased RNA level of p21WAF1 and decrease RNA level of HDM2 upon KRP6DD expression, suggesting that plant‐derived KRP6 protein has the capacity to interfere with the cell‐cycle machinery in mammalian cells by a different mechanism from CARF, and that KRP6 may functions as a potential exogenous suppressor of lymphoma.