Figure 2 (IMAGE) Tokyo Medical and Dental University Caption Seasonality of menstrual cycle length, follicular phase temperature, and luteal phase temperature. Probability densities were calculated for each month, and their distributions are shown in the heat maps. Credit Department of Pediatrics, Perinatal and Maternal Medicine (Ibaraki),TMDU Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.