Platelets and blood vessels (IMAGE) Uppsala University Caption Platelets are activated in blood vessels in wounds but also in tumour blood vessels. The study proves that PDGFB released from platelets, when activated, plays an essential role in attracting supporting cells to the blood vessels and in preventing tumour cells from spreading. Credit Yanyu Zhang Usage Restrictions To accompany coverage of Yanyu Zhang's research. 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.