Figure 3From: HTR4 gene structure and altered expression in the developing lungImmunohistochemistry of 5-HT 4 R in fetal lung tissue. Weak staining is apparent in early Embryonic stages which increases in intensity with age leading to strong staining in the Pseudoglandular and moderate staining in the Canalicular stages. a-l represent age ordered samples of 19 days (a, b), 21 days (c, d), 23 days (e, f), 10 weeks (g, h), 12 weeks (i, j), 17 weeks (k) and 19 weeks (l). All isotype controls were negative (data not shown). X40 magnification.Back to article page