GDP-alpha-D-glucose + alpha-D-mannose 1-phosphate = alpha-D-glucose 1-phosphate + GDP-alpha-D-mannose
gdp-alpha-d-glucose + alpha-d-mannose 1-phosphate = alpha-d-glucose 1-phosphate + gdp-alpha-d-mannose
GDP-alpha-D-glucose + alpha-D-mannose 1-phosphate = alpha-D-glucose 1-phosphate + GDP-alpha-D-mannose
gdp-alpha-d-glucose + alpha-d-mannose 1-phosphate = alpha-d-glucose 1-phosphate + gdp-alpha-d-mannose