“…Semithin sections were prepared from purified pea mitochondria, pea flower buds, young (6 d old), and mature leaves (fully expanded, 11 d old) as in Marttila et al, (1996). To be brief, the material was fixed in 4% (w/v) paraformaldehyde and 0.25% (v/v) glutaraldehyde in phosphatebuffered saline (PBS) (10 mm Na-phosphate buffer, pH 7.4, 150 mm NaCl) for 2 h at room temperature, dehydrated, infiltrated with medium-grade London Resin White (London Resin Company Ltd., Reading, UK; distributed by TAAB, Aldermaston, UK), and polymerized for 24 h at 58°C.…”