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Narayan singh Best Answer
In the laboratory, the loops may also be created by the hybridization of mature mRNA with double-stranded DNA under conditions favoring the formation of a DNA-RNA hybrid; in this case, the intron regions (which have been spliced out of the mRNA) form single-stranded loops, as they cannot hybridize with complementary sequence in the mRNA. so ans is 4th due to non coding region introns...