The specificity of four monoclonal antibodies, raised against mammalia
n ciliary axonemes, was determined by both immunofluorescence and immu
noblot experiments. Three antibodies reacted with epitopes which are d
ifferentially located along axonemal length. Among these, antibody 3.1
2 recognized an epitope common to different dynein heavy chains, react
ed only with tracheal cilia and specifically stained the proximal port
ion of the ciliary axoneme.