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By a variety of methods, such as ultracentrifugation in different media, hypoosmotic activation and hydrostatic compression, subcellular particles were characterized at different perinatal ages and compared to the adult rats. Fetal mitochondria elicited a higher density, an increased osmotic space and a greater resistance to compression. The size of these particles was larger than in the adults. Mitochondria in the 1-day-old animals were freely permeable to sucrose and their external membranepmid:1627465 fatcat:lrl6wgew7zbgxjpswgks3womky