Final answer:
LADA (latent autoimmune DM of adults) is a subtype of diabetes mellitus characterized by the presence of autoantibodies, including GAD antibody.
Step-by-step explanation:
LADA (latent autoimmune DM of adults) is a subtype of diabetes mellitus that is characterized by the presence of autoantibodies. One autoantibody that is commonly seen in LADA is GAD (glutamic acid decarboxylase) antibody. This antibody targets the GAD enzyme that is responsible for the production of gamma-aminobutyric acid (GABA), an inhibitory neurotransmitter. The presence of GAD antibodies in LADA suggests an autoimmune mechanism underlying the development of the disease.