Mannose 1-phosphate is converted to GDP-Mannose by mannose-1-phosphate guanyltransferase alpha (Gmppa) in rat (Verachtert H et al, 1966).
Verachtert, H, Rodriguez, P, Bass, ST, Hansen, RG
mannose-1-phosphate guanylyltransferase activity of Gmppa [cytosol]
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