Porous Silicon Microparticles (IMAGE) Houston Methodist Caption The porous silicon microparticles are about 1 micrometer in diameter. The hollow channels within each microparticle can be loaded with antigens -- such as HER2 -- that can help train the immune system to recognize and destroy cancer cells overexpressing HER2. Credit Haifa Shen lab 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.