Relatively clean snow and ice in the Indus River Basin during the COVID-19 pandemic may have reduced meltwater in 2020, compared with the 20-year average.
Image credit: Pixabay/Abdullah_Shakoor.
Edited by Michael Lynch, Indiana University, Bloomington, IN, and approved January 17, 2012 (received for review August 4, 2011)
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- Published in issue February 28, 2012.
- Published online February 28, 2012.
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- ↵1To whom correspondence should be addressed. E-mail: jason.kubinak{at}path.utah.edu.
Author contributions: J.L.K., J.S.R., P.R.S., and W.K.P. designed research; J.L.K. and C.W.H. performed research; J.L.K. and W.K.P. analyzed data; and J.L.K. and W.K.P. wrote the manuscript.
The authors declare no conflict of interest.
This article is a PNAS Direct Submission.
This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1112633109/-/DCSupplemental.
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Experimental viral evolution to specific host MHC genotypes reveals fitness and virulence trade-offs in alternative MHC types
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