(IMAGE) Hong Kong University of Science and Technology Caption Samples of COVID-19 patients show the loss of PSG proteins in placental cells and reduced PSG gene expression, which could affect the placental development. Credit HKUST Usage Restrictions N/A License Original 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.