Cover photograph (Copyright © 2002, American Society for Microbiology. All Rights Reserved.): Immunohistochemical localization of NoIX. Six-day-old cowpea (Vigna unguiculata [L.] Walp) nodules were embedded in paraffin and processed for localization of Sinorhizobium ferdii UDSA257 NoIX, a type III-secreted protein involved in soybean cultivar specificity. The burgundy color indicative of specific labeling of NoIX is predominantly present in the infection threads. (See related article on page 831.)
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