Fig. 3From: Developing a vaccine against velogenic sub-genotype seven of Newcastle disease virus based on virus-like particlesExpression of green fluorescent protein (GPF) in Sf-9 cells in vitro. The Sf-9 cells were transfected with the recombinant baculoviruses (BAC-mid). After 48 h (A), 72 h (B), and 96 h (C) of transfection, successful transfection was confirmed with green fluorescent observation by an inverted fluorescence microscope (magnification, x400)Back to article page