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Compare that to oral medications that might never get absorbed at all

Structural biology of the tumor suppressor p53

The members of the miR-148/152 family inhibit cancer stem cell-like properties in gastric cancer via negative regulation of ITGA5

the pharmaceutical formulation may include one or more polymers at a concentration of from about 0.0001% (w/w) to about 0.001% (w/w), from about 0.001% (w/w) to about 0.01% (w/w), from about 0.01 % (w/w) to about 0.1 % (w/w), from about 0.1% (w/w) to about 1% (w/w), from about 0.1 % (w/w) to about 10% (w/w), from about 0.5% (w/w) to about 5% (w/w), from about 1% (w/w) to about 10% (w/w),from about 2% (w/w) to about 30% (w/w), from about 5% (w/w) to about 15% (w/w), from about 10% (w/w) to about 30% (w/w), from about 10% (w/w) to about 40% (w/w), from about 15% (w/w) to about 15% (w/w), from the pharmaceutical formulation may include one or more polymers at concentrations such as, but not limited to, 20 % (w/w), 21% (w/w), 22% (w/w), 23% (w/w), 24% (w/w), 25% (w/w), 26% (w/w), 27% (w/w), 28% (w/w), 29% (w/w), and/or 30% (w/w)

PNAS 95: 2059-3064 Obeid etal, Cobalamin coenzyme forms are not likely to be superior to cyano- and hydroxyl-cobalamin in prevention or treatment of cobalamin deficiency