stj3/Df(2R)Exel7128 animals generally arrest as pupae, with some animals emerging as uncoordinated adults.
Evoked excitatory junctional potentials (EJPs) at the third instar larval neuromuscular junction have a reduced amplitude compared to controls in stj1/stj3 and stj3/Df(2R)Exel7128 animals.
The chromosome may contain second site lethal mutation(s), as the lethal phase of homozygotes is earlier than that of hemizygotes or of transheterozygotes.