CCL3 and CCL4 protein expression in ZAP-70⁺ and ZAP-70⁻ CLL cases. Displayed are the mean and SEM for CCL3 (A) and CCL4 (B) protein concentrations in supernatants from ZAP-70⁺ CLL samples (, n = 10) or ZAP-70⁻ CLL samples (, n = 10). In ZAP-70⁺ CLL samples, we found higher levels of both CCL3 and CCL4 at all time points. However, these differences did not reach statistical significance.