A: The variant NC_000021.9:g.31667306C>T in gene SOD1 is classified as 'Likely_benign' for Amyotrophic_lateral_sclerosis_type_1. Molecular consequence: SO:0001819: synonymous_variant. Variant type: single_nucleotide_variant. Disease database links: MONDO:MONDO:0007103,MedGen:C1862939,OMIM:105400,Orphanet:803. Review status: criteria provided, single submitter.