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nbsp;Limited supplies have left many Americans eager to receive the first dose of either vaccine with canceled appointments, and some states, such as Alabama, threatening to remove vaccine supplies from providers who don’t administer the jabs in a "timely way. tiempo genio tf Associated Press)Biden's executive order, the "100-day masking challenge," will require masks and social distancing in all federal buildings, on all federal land and by federal employees and contractors, and on airlines, trains, and transit systems traveling between states. tiempo genio tf RELATED: QUICK GUIDE ON COVID-19 VACCINES AND HOW THEY WORK"Proteins are very flexible in their abilities to interact with receptors or antibodies; they are capable of [tolerating] mutation in quite a number of different ways to achieve the same endpoint," Moore said. tiempo genio tf nbsp;"The ability to quickly utilize data that has already been collected across the country to compute individual-level risk scores is crucial for effectively allocating and distributing resources, including prioritizing vaccination among the general population," said Dr. tiempo genio tf