in the last 5 days of cultivation the explants were treated with dexamethasone ( 10 ng/ml ) or betamethasone ( 10 ng/ml ) or fenoterol ( 10 ng/ml ) , or fenoterol + dexamethasone , or bromhexine viii metabolite ( ambroxol : 12 ng/ml ) and were then prepared for electronmicroscopic examination .
C0006220
bromhexine
C0002421
ambroxol