Claim: A subclass of anti-nuclear antibodies are anti-Sm antibodies.
Evidence: There are many subtypes of ANAs such as anti-Ro antibodies , anti-La antibodies , anti-Sm antibodies , anti-nRNP antibodies , anti-Scl-70 antibodies , anti-dsDNA antibodies , anti-histone antibodies , antibodies to nuclear pore complexes , anti-centromere antibodies and anti-sp100 antibodies.