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![Immunohistochemistry of the circadian clock in mouse and human vascular tissues](https://image.oaes.cc/d971cfec-1bb8-4d4f-9ab0-98e712fa7c52/2696.fig.2.png)
Figure 2. Circadian clock expression in human saphenous vein. Human saphenous veins that remained from coronary artery bypass were immediately procured post-operatively, and incubated in an oxygenated 37 °C incubator. At indicated times, sections of the saphenous vein were frozen in OCT, then sectioned, and incubated with indicated antibodies to the circadian clock