这是一张修改过的图片，这意味着它已在原版本的基础上通过软件进行了编辑，改动内容：cropped the image。其原始版本为：R Holley.jpg。修改者：Orlady。

This image is in the public domain because it contains materials that originally came from the Agricultural Research Service, the research agency of the United States Department of Agriculture. العربية ∙ dansk ∙ Deutsch ∙ English ∙ español ∙ فارسی ∙ français ∙ italiano ∙ 日本語 ∙ македонски ∙ മലയാളം ∙ Nederlands ∙ português ∙ sicilianu ∙ Türkçe ∙ Tiếng Việt ∙ 中文 ∙ +/−

This image is a derivative work of the following images:

• File:R_Holley.jpg licensed with PD-USGov-USDA-ARS
  • 2006-09-26T06:08:24Z PDH 640x436 (113587 Bytes) [http://www.ars.usda.gov/is/graphics/photos/jul05/d133-1.htm Image Number D133-1] A team of ARS and Cornell University researchers, some of whom are pictured here, was the first to determine the molecular structure of RNA. T

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