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Relative expression of KOR-like genes in various Populus tissue types. Relative expression (arbitrary units) was based on difference in critical threshold (CT) values between target gene and average of housekeeping genes, Ubiquitin-conjugating enzyme E2 and 18S ribosomal RNA. Expression of PdKOR5 (KOR5) was below quantifiable limits. YL, young leaf; ML, mature leaf; YS, young stem; MS, mature stem; PET, petiole; PHL, phloem; XYL, xylem; RT, root. Data represent means ± SE (n = 3).
