Cellulose Nitrate

These are much thicker (~150 µm) fibrous filters, sometimes referred to as “torturous path” filters. Rather than counting cells that have migrated through the membrane, as is commonly done with PCTE membrane, these filters are clarified with solvents after a predetermined incubation, and a high-resolution light microscope is used to observe how far into the filter the cells have migrated. This is also known as a “leading edge” study.

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