Santoso P., Biology Department, Faculty of Mathematics and Natural Sciences, Andalas University, Padang, Indonesia; Ilyas S., Department of Biology, Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara, Medan, Indonesia; Midoen Y.H., Department of Medical Biology, Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia; Maliza R., Biology Department, Faculty of Mathematics and Natural Sciences, Andalas University, Padang, Indonesia; Belahusna D.F., Biology Department, Faculty of Mathematics and Natural Sciences, Andalas University, Padang, Indonesia