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Caption: X-ray of a common oak tree gall (Quercus sp.). These galls are sometimes called Oak-apples. A gall is an abnormal growth or swelling formed by a plant as a result of an attack by parasites such as bacteria, fungi, nematodes, insects or mites. This kind is caused by the larvae of parasitic wasps. Oak-apples are valued for the high-content of tannin within them.

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Keywords: abnormal growth, bacteria, common gall, common oak apple, common oak gall, common oak tree gall, common oak-appl, common oakapple, fungi, fungus, gall, growth, insect, larva, larvae, mite, nematode, oak, oak apple, oak gall, oak tree, oak tree gall, oak-apple, parasite, parasitic wasp, parasitic wasp larva, parasitic wasp larvae, plant, quercus sp., quercus spp., radiograph, ray, spectrum, swell, swelling, tannin, wasp, wasp larva, wasp larvae, x ray, x-ray, xray

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