Epidermal Growth Factor Promotes E6 and CCL-81 Vero Cells Proliferation Under Serum-Free Condition oleh Diena Delaiah, Ahmad Aswin, Helen Susilowati, Andi Yasmin Wijaya, Firdausy Kurnia Maulana, Diyantoro Diyantoro, Watchareewan Rodprasert, Yulianna Puspitasari, Yeni Dhamayanti, Suryo Kuncorojakti