RDs	Rare diseases
RND	Rare Neurological Disease
RNDs	Rare Neurological Diseases
ERN	European Reference Networks
ALS	Amyotrophic lateral sclerosis
MRI	Brain magnetic resonance imaging
NCS	Nerve conduction study
EMG	Electromyography
ECG	Electroencephalography
SPECT	Single-photon emission computed tomography
PET	Positron emission tomography
DAT-Scan	Dopamine transporter scan
TTR	Transthyretin
DNA	Deoxyribonucleic acid
RNA	Ribonucleic acid
Abs	Antibodies
anti-NMDAR	Abs against N-methyl-D-Aspartate Receptor
anti-GAD	Abs against Glutamic acid decarboxylase
PCR	Polymerase chain reaction
RT-QuIC	Real-time quaking-induced conversion
MELAS	Mitochondrial encephalomyopathy, lactic acidosis and stroke-like episodes
hATTR	hereditary TTR-mediated amyloidosis
CNS	Central nervous system