It appears to be classical grafting with drone larva. The drone larvae are perhaps fed a combination of drone, worker, and queen royal jelly by the bees which is recommended for ulcer and other wound treatments; along with booting libido. Never tried drone jelly but we had a Russian beekeeper speak at club many years ago who said it was better than a certain pill which is advertised pretty heavily.
www.caspianapiaries.com/presentation/Ulcer treatment.pdf
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