The Arkansas Railroad Museum preserves the last steam-powered locomotive built in Arkansas and includes various artifacts of Arkansasâs railroad heritage. The Pine Bluff/Jefferson County Historical Museum opened in 1980 in the restored 1907 Union Pacific train depot.
myasthenia gravis. An autoimmune disease affecting neuromuscular junctions characterized by muscle weakness and fatigability. It is due to a destruction of acetylcholine receptors in the postsynaptic membrane of the neuromuscular junction.
Congenital disorder. A congenital disorder, also known as birth defect, is a condition existing at or before birth regardless of cause. Of these disorders, those characterized by structural deformities are termed congenital anomalies and involve defects in a developing fetus. Birth defects vary widely in cause and symptoms.