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Missing or incomplete documentation and improper modifier use are common causes

Cells were treated for 24 h with 0.1600 M NNMT inhibitors in cell culture media

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Inadequate use of vitamin B 12 , which may occur if antimetabolites for the vitamin are employed in the treatment of neoplasia Pernicious anemia is the most common cause of vitamin B 12 deficiency

Vitamin B 12. BMJ, vol
