RT Journal Article SR Electronic T1 Quantitative characteristics of the Feyrter (APUD) cells of the neonatal rabbit lung in normoxia and chronic hypoxia. JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 449 OP 456 DO 10.1136/thx.32.4.449 VO 32 IS 4 A1 A Hernandez-Vasquez A1 J A Will A1 W B Quay YR 1977 UL http://thorax.bmj.com/content/32/4/449.abstract AB Our studies show that the apparent number of Feyrter cells in the lung declines during the neonatal period in normoxic rabbits, and that in hypoxic animals a uniformly and significantly lower number of cells occurs as compared with the normoxic rabbits. There is some indication of degranulation of cells in the hypoxic groups. It is suggested that environmental and/or physiological factors associated with the start of extrauterine life, or lung development, may affect the apparent number and probable level of activity of these cells. These changes seem to be enhanced by hypoxia. Mast cells are scarce, and Feyrter cells are relatively more numerous along the airways. These cell types could possibly represent storage sites for 5-hydroxytryptamine, as suggested also by other investigators. Intraepithelial nerve fibres in bronchi and bronchioles were found but they were not limited to innervations of Feyrter cells or related cell bodies.