To obtain further insight into the function of FLRaV P25 and P37 during viral infection, full-length open reading frames encoding P25 and P37 were fused to the green fluorescent protein (GFP), respectively, and expressed in transgenic N. benthamiana plants harboring red fluorescent protein (RFP)-H2B via agroinfiltration. The gene discussed is H2BC21; the disease is viral infectious disease.