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Fraction eluted from P. vietnamensis plantlets cultured in vitro samples. 1–5: red, blue, yellow, white and green LEDs; 6: fluorescent lamp; 7: 3U compact fluorescent lamp; 8–16: red LED combined with blue LED at the ratios of 90:10, 80:20, 70:30, 60:40, 50:50, 40:60, 30:70, 20:80 and 10:90, and reference samples.
