Cells with endoreduplication and fragments significantly increase in blood cultures from women over 60 years. Satellite associations of D- and G-group chromosomes are investigated in blood samples derived from females at ages of 0, 20, 40 and over 60 years. Associations show an increased tendency in cells from females older than 40 years. The involvement of no. 21 chromosome in association is particularly excessive and impressive.
In five subspecies of Carassius auratus, such as C. a. langsdorfii, C. a. cuvieri, C. a. grandoculis, C. a. buergeri, and C. a. subsp., the C-banding patterns of chromosomes are comparatively investigated. C. a. langsdorfii is characterized by a pair of markers with remarkable C-bands on the short arms of the second largest submetacentrics. In C. a. subsp. there are two such markers in the female and one in the male. Our particular thanks are due to Emeritus Professor Sajiro Makino, M. J. A., for his invaluable advice and revision of the manuscripts.
Dense core vesicles (DCVS) in neuronal perikarya in the arcuate neurons of female adult mice were counted on ultrathin sections. In the ventromedial area of the middle region of the ARC (vm-mARC), a large number of neurons contained varying numbers of DCVS. Treatments of mice with reserpine or nialamide plus α-methyl-dopa brought about no significant change in the occurrence and distribution of neurons with DCVS. Therefore, it is unlikely that DA is concentrated into DCVS in the vm-mARC.