ERVW-1 and hemangioma: env genes of the three isolates and other hemangioma isolates was 88.5-91.7% identical to that of ML strains at the aa level, but a much higher identity (92.7-99.6%) was found with all hemangioma strains (except for HLJ09MDJ-1 and NHH), which may be indicative of the close relationship among hemangioma isolates.