pretreatment of the dogs ( n = 5 ) with atropine , hexamethonium and the specific srs-a ( ltc4 ) antagonist fpl 55,712 ( n = 3 ) gave a statistically significant ( p less than 0.01-0.05 ) reduction in mucus secretion at all times for atropine , hexamethonium , and at all times except 4 min for ( fpl 55,712 ) .
C0038091
srs-a
C0023542
ltc4