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Source |
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1078579 | PMC |
http://dx.doi.org/10.1073/pnas.29.6.172 | DOI Listing |
Proc Natl Acad Sci U S A
June 1943
The New York Botanical Garden and Department of Botany, Columbia University.
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