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β‐Glucuronidase (GUS) expression in soybean leaf tissues following biolistic inoculation with Soybean mosaic virus (SMV)‐N‐GUS. Attached primary leaves were inoculated and tissues were harvested for GUS expression analysis at 21 days post‐inoculation. It should be noted that SMV‐N‐GUS was capable of limited systemic infection in PI88788 (Rsv4), but not in V94‐5152 (Rsv4). The arrow points to small foci of infected cells expressing GUS, which are displayed in the enlarged insert.
