Figure 6From: Virus-like particle production with yeast: ultrastructural and immunocytochemical insights into Pichia pastoris producing high levels of the Hepatitis B surface antigenPurified VLPs composed of HBsAg. Transmission electron microscopy of negatively stained HBsAg VLPs after purification from detergent-treated cell lysate. Cells were collected after 170 h of growth on methanol and the HBsAg purified from the cell lysate as described in the Materials and Methods section. (A) Survey of negatively stained HBsAg VLPs and (B) close-up view revealing particles of uniform diameter (~22 nm) and approximate icosahedral contour.Back to article page