Subjected to extreme environmental influences, such as weightlessness and oxygen deprivation, their internal structures underwent mutations, Wang said.

Upon returning to Earth, they were cultivated by agricultural experts for years.

"The vitamin content of space vegetables is more than twice that of ordinary vegetables, and beneficial trace elements for the human body also increased," Wang said, adding that the space crops have made breakthroughs in yield and disease resistance compared with ordinary earthbound varieties.

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