Abstract
Ribonucleic acids having template activities were obtained from particulate components prepared from the postribosomal supernatant of soybean seeds. These RNA were 9 S and 18 S in size, and these corresponded to the components (9 S, 18 S) of high molecular weight RNA (H–RNA) prepared from the supernatant of 100,000×g centrifugation. The sizes of the particulate components were 37 S and 59 S, respectively. Larger particles contained 18 S and 9S RNA, and smaller particles contained 9S RNA, but not 18 S RNA. Those particulate components differed in absorption pattern and in the behaviour on sucrose gradient centrifugation depending on the concentration of Mg27+ from the subunits of ribosomes.