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Mesabi Trust operates as a royalty trust in the United States. The company is involved in the conservation and protection of the assets held. The company's principally wholly-owned segment is the iron ore mining segment and it generates income from the Peter Mitchell Mine, an iron mine located near Babbitt, Minnesota, at the eastern end of the Mesabi Iron Range.
Rigel Pharmaceuticals Inc develops small-molecule drugs for autoimmune, cancer-related, and viral diseases. The firm's primary drug is an oral rheumatoid arthritis drug candidate that has been licensed to AstraZeneca. Astra has taken overall responsibility for developing and marketing the drug and will pay Rigel royalties and milestone payments. Its pipeline product includes TAVALISSE (fostamatinib disodium hexahydrate) tablets, the only oral spleen tyrosine kinase (SYK) inhibitor, Fostamatinib, R289, R552, R835, DS-3032, THF-beta Inhibitors, and AZD0449- Inhaled JAK Inhibitor.