we found the nuclear numerical density per cubed centimeter ( nvn ) of clara cells fell and the nvn of ciliated cells increased from birth to age 60 days , the prenatal administration of a glucocorticosteroid ( dexamethasone ) to dams caused a 35 % decrease in the nvn of ciliated cells present at birth but did not alter the nvn of clara cells , the administration of dexamethasone to pups from postnatal days 1 to 6 did not alter the nvn of bronchiolar clara or ciliated cells present at age 7 days but did diminish the total number of lung cells as assessed by measurements of lung dna , the administration of dexamethasone to dams from gestation days 18 to 20 or from gestation days 20 to 22 did not alter the volume density of clara cell glycogen , secretory granules , rough endoplasmic reticulum , or mitochondria of pups at gestation day 21.5 or on the day of birth , and glucagon , epinephrine , and 8-bromoadenosine 3',5'-cyclic monophosphate resulted in a decrease of clara cell glycogen when individually incubated in vitro for 4 h with bronchiolar tissue from rat fetuses 21.5 days of age .
C0007634
the
C0886515
secretory granules