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5-HT2AR-ir neurons in the RM (A), ROb (B), RP (C), RTN/pFRG (D), NTSVL (E), and NTSCOM (F) at P2 (A1–F1), P7 (A2–F2), P12 (A3–F3), and P21 (A4–F4). The labeling was relatively constant with statistically insignificant fluctuations from P2 to P21. Scale bar: 20 µm for all.
