The research described in this article has been published on a preprint server but has not yet been peer-reviewed by scientific or medical experts. In hopes of developing a possible treatment for Covid-19, a team of MIT chemists has designed a drug candidate that they believe may block coronaviruses’ ability to enter human cells. The potential drug is a short protein fragment, or peptide, that mimics a protein found on the surface of human cells. The researchers have shown that their new peptide can bind to the viral protein that…