Watanabe T, Ohwada K, Endo A
Department of Hygiene and Preventive Medicine, Yamagata University School of Medicine, Japan.
Experientia. 1988 Mar 15;44(3):254-5. doi: 10.1007/BF01941728.
Sex chromatin of unstained mouse amniotic cells was identifiable using ordinary brightfield microscopy with optimal setting of the illumination.