The oause of the ohange in nuoleolar BNA oompoeition is un- known and my be the result either of ohanged proportions between different BNA fraotions, known to exist here (Vinoent, 1954; Sibatani et al. 19621 Adams and Busoh, lY62), or of --
The oause of the ohange in nuoleolar BNA oompoeition is un- known and my be the result either of ohanged proportions between different BNA fraotions, known to exist here (Vinoent, 1954; Sibatani et al. 19621 Adams and Busoh, lY62), or of --