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Semi-granular cells of Litopenaeus vannamei after EPS administration with different immersion concentrations. Day 1: EPS administration; Day 7: no treatment; Day 8: EPS booster; Day 9: post-infection with Vibrio harveyi, 107 cells/mL. Bars represent mean with SD; different letters (a, b, c, d) between the bars indicate highly significant differences (p < 0.05).
