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Basic status (time 0 h, study 2) of the β-carotene (A) and lycopene (B) level [a.u.] in blood plasma for non-smokers (nSm, n = 10) and strong-smokers (sSm, n = 10, ≥ 10 cigarettes/day), measured by RRS spectroscopy. Boxplot chart with percentile 25, 75, median (black line), mean (black square) and outlier (black cross), ** p ≤ 0.01.
