Davis R H, Kramer D L, Sackman J W, Kyriazis G
Lab Anim Sci. 1975 Jun;25(3):319-20.
In adult rhesus monkeys each phase of 37 menstrual cycles was accurately classified by cellular identification of vaginal smears stained with red ink. This technic was simple, quick, and inexpensive, and produced well-stained slides in a few seconds.
在成年恒河猴中，通过对用红墨水染色的阴道涂片进行细胞鉴定，准确划分了37个月经周期的每个阶段。这项技术简单、快速且成本低廉，能在几秒钟内制作出染色良好的玻片。
