24 HOURS VARIATIONS OF MITOTIC-ACTIVITY IN MALE RAT ADRENAL-CORTEX

  • 1 January 1975
    • journal article
    • research article
    • Vol. 169  (6) , 1421-1423
Abstract
Working on histologic sections 7 .mu. thick in the equatorial part of the male rat adrenal cortex, 2 high mitotic activity periods were found. The 1st one stays at midnight and shows an average number of 42 mitoses per section; the 2nd one occurs at 5 a.m. with an average number of mitoses of 70.1 per section. Except for these particular points, the mitotic activity is low, the average number of mitoses being 13.2 per section.