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Effect of 5-aminolevulinic acid (ALA) on morphology of second stage juveniles of Meloidogyne incognita observed under a transmission electron microscope. Thin sections were taken from an ALA-treated J2 (A) or from a water-treated J2 (B). Au: autophagy; mi: mitochondria; n: nucleus; rer: endoplasmic reticulum.
