Immunohistochemical staining of PD-L1 (IMAGE) Hokkaido University Caption Immunohistochemical staining of PD-L1 in tick-nonattached (left) and tick-attached (right) sites on cattle. An increase in PD-L1 positive immune cells (visually, an increase in the amount and intensity of brown areas) was observed in tick-attached sites. (Yamato Sajiki, et al. Scientific Reports. January 13, 2021). Credit Yamato Sajiki, et al. Scientific Reports. January 13, 2021 Usage Restrictions This image is copyrighted but may be used to report this press release if credited as instructed. 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.