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A protein which can speed a biological reaction without being permanently chanced by the reaction?

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En tidigare frisk 12-årig flicka insjuknar i halsfluss.Vid inspektion ses svullna och rodnade tonsiller med gulaktiga beläggningar och rodnade gombågar. Ett odlingssvar utfaller positivt för grupp A beta-hemolyserande streptokocker.Hon tillfrisknar, men ca 3 veckor senare blir hon dålig igen. Denna gång har hon bröstsmärtor, feber och sjukdomskänsla samt klagar på smärtor i lederna, i knän, armbågar, höfter och skuldror. Man noterar vid undersökning att hon har flera subkutana "knutor" och man noterar att hon har skakningar i huvud och hals. I laboratoriesvaren noteras förhöjda titrar av antistreptolysin-O antikroppar och förhöjning av hjärtmuskelrelaterad kreatinkinas (CK-MB).Vilken av följande immunologiska reaktionsmekanismer förklara bäst flickans sjukdomsbild? (1p)a. Debut av juvenil reumatoid artrit (RA) b. Komplementmedierad cellnedbrytningc. Blockering av receptorfunktion betingar av anti-receptor antikroppard. Fördröjd överkänslighetsreaktion (typ IV)e. Förlust av tolerans för kroppsegna antigen pga korsreaktivitet med mikrobiella antigen

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