Abstract
Small pieces of tissue, and cell suspensions in plastic artificial insemination (AI) ‘straws’, were frozen rapidly in Freon-12 at — 155°C, without pre-treatment. Peripheral fragments were thawed directly in 2% glutaraldehyde at 0°C, and processed for transmission electron microscopy (TEM) studies. Preservation of ultrastructure was satisfactory, and freezing artifacts were minimal.

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