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Recombinant human ERBB4 (v-erb-a erythroblastic leukemia viral oncogene homolog 4 (avian)) overexpression cell culture supernatant, secreted from the serum-free medium of transfected HEK293 cells (200 µl). Purchase will also include one vial of normal control, the culture supernatant of HEK293 cell transfected with empty expression vector.