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Effect of UV-C radiation and melatonin on (a) Total phenolic content (TPC, mg/g DW) and total phenolic production (TPP, mg/L), (b) Total flavonoid content (TFC, mg/g DW) and total flavonoid production (TFP, mg/L) in callus culture of L. sativum. Values represent means ± standard errors from triplicates. Columns with similar alphabets (letters a–e) are not significantly different (p < 0.05).
