50.4 MB (50.0 MB compressed)
3364 x 5232 pixels
28.4 x 44.2 cm ⏐ 11.2 x 17.4 in (300dpi)
PEGGY GREB / US DEPARTMENT OF AGRICULTURE / SCIENCE PHOTO LIBRARY PEGGY GREB / US DEPARTMENT OF AGRICULTURE / SCIENCE PHOTO LIBRARY
Editorial use only.
Plant pest resistance research. Technician preparing to extract RNA (ribonucleic acid) from samples of potato leaves treated with a systemic acquired resistance (SAR) activator. SAR is analogous to an animal's innate immune system. SAR activators are used to activate a plant's resistance to pathogens and infections.
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