Identification of proteins in A/chicken/Korea/ES/2003(H5N1) VLPs. (A) Coomassie‐stained SDS‐PAGE analysis of VLPs expressing HA, NA, and M1. M, a standard molecular size marker (in kilodaltons); Lane 1, 210 HAU of VLP protein; Lane 2, 29 HAU of VLP protein; Lane 3, 28 HAU of VLP protein. (B) Analysis of VLPs by Western blot using mouse anti‐H5 monoclonal antibody and rabbit polyclonal antibodies for N1 or M1. Molecular weights of expressed HA, NA, and M1 are indicated on the left.