Figure 2. Effect of gradually decreasing photoperiod on PHA response in Siberian hamsters. Asterisk (*) indicates statistical significance at P﹤0.05, determined by independent t-test analysis. From: Effect of Gradually Decreasing Photoperiod on Immune Function in Siberian Hamsters Trends Journal of Sciences Research. 2018;3(1):1-9. doi: 10.31586/Biology.0301.01 Trends Journal of Sciences Research | © The Author 2018. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. 1