Synthesis of Fructose and lactose

Fructose is synthesised in the prostate gland. It is secreted into the seminal fluid as the fuel for sperm. It is synthesised from glucose as follows 

Reactions are catalysed by aldose reductase and iditol dehydrogenase. (For details, see Appendix 6.6). 

Lactose is a disaccharide of glucose and galactose linked by a 1,4 glycositic bond. It is the only disaccharide synthesised in large quantities in mammals where its sole 

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