CD28 is a critical target for PD-1 blockade.


The changing surface of a comet From 2014 to 2016, the Rosetta spacecraft investigated comet 67P/Churyumov-Gerasimenko as it passed through the inner solar system. El-Maarry et al. compared images of the surface taken before and after the comet’s closest approach to the Sun. Numerous geological changes were evident, including cliff collapses, large boulders… (More)
DOI: 10.1126/science.355.6332.1386-b

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