Direct Epoxy Embedding for Vertical Sectioning of Cells Grown as a Monolayer on Millipore Filter

Cells cultured as a monolayer on MF-Millpore GSWP. 0.22 μ pore size, filter were fixed, dehydrated, and examined by phase-contrast microscopy with the filter immersed in a 1:1 mixture of xylene and the embedding medium. The membrane was cut into 2 × 20 mm strips, and each strip which was selected for desired cells was embedded vertically in a BEEM capsule. Thus direct embedding which allowed edgewise sectioning of cells was obtained without removing them from the culturing support.