title: Antiperinuclear factor in the polyarticular form of juvenile chronic arthritis: are use of frozen material or age of patients relevant?
authors.forename: J M
authors.initials: JM
authors.lastname: Berthelot
mesh_terms: D000293:Adolescent; D000367:Age Factors; D000974:Antibodies, Antinuclear / Q000097:blood*; D001171:Arthritis, Juvenile / Q000276:immunology*; D002648:Child; D015925:Cryopreservation; D006801:Humans; D007074:Immunoglobulin G / Q000097:blood
chemical_list: D000974:Antibodies, Antinuclear; D007074:Immunoglobulin G; C030902:antiperinuclear factor