<unk>  is a condition where insufficient<unk>  is available for metabolic needs.  Its etiology is usually nutritional, but can also be associated with malabsorption, or can be congenital (acrodermatitis enteropathica).
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Zinc deficiency
Manganese deficiency 
Lead poisoning
Copper deficiency
Biotin deficiency
Folate deficiency
Mercury poisoning
Chromium deficiency