adj. Of, pertaining to, situated at, or operating at a junction
The Century Dictionary and Cyclopedia
Pertaining to a junction: as, “junctional lines,”
Word Usage
"Humans that have a mutation in laminin-332 genes (at least 3 different LAMA genes), on the other hand, suffer a condition called junctional epidermolysis bulossa (or JEB) also characterized by severe skin layer separation and blistering."