Figure 3From: Stability studies of HIV-1 Pr55gagvirus-like particles made in insect cells after storage in various formulation mediaVLPs stored in 15% trehalose at −70°C and subjected to different freeze-thaw cycles. A) 0 freeze-thaw cycles. B) 1 freeze-thaw cycle after 1 month. C) 2 freeze thaw cycles after 3 months; white arrows indicate electron dense areas. D) 3 freeze-thaw cycles after 6 months. Scale bars = 500 nm.Back to article page