Expression of mRNA for CC chemokine ligand 18 (CCL18) and CX3C chemokine receptor 1 (CX3CR1). Lane C, non‐specific lymphadenitis; lanes 1 and 2, human T‐cell leukemia virus type 1 (HTLV‐1)‐associated lymphadenitis; lanes 3 and 4, Hodgkin's‐like type lymph node lesion; lanes 5 and 6, pleomorphic type lymph node lesion; lanes 7 and 8, anaplastic large cell type lymph node lesion. Reverse transcription–polymerase chain reaction (RT‐PCR) products for CCL18 were found in HTLV‐1‐associated diseases, but was rarely detected in the control case. The density of RT‐PCR bands for CX3CR1 in HTLV‐1‐associated lymphadenitis and Hodgkin's‐like type were the same as in the control case, but the density in pleomorphic type and anaplastic large cell type were weak. β‐Actin was used an internal standard. Clear β‐actin product can be seen for all cases used in this experiment.