Electron microscopy of plant extracts. (A) Electron micrograph of T3 generation A. thaliana-derived HPV-11 L1 NLS- VLPs. (B) Electron micrograph of N. tabacum-derived HPV-11 L1 NLS- VLPs. Particles were immunotrapped using polyclonal antiserum at a dilution of 1:50 and on average range from 30 to 60 nm in diameter. (C) The positive control shows H11;H3 immunotrapped insect cell-derived HPV-11 L1 NLS- VLPs, whereas immunotrapped non-transgenic plant protein extract is represented in D.