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It also has a layer of muscle close to the surface which promotes absorption of B12

Pharmaceutical approaches to colon targeted drug delivery systems

doi: 10.1016/S0736-0266(03)00110-4

Chorioallantoic angiogenesis membrane assay (CAM) Fertilized chicken eggs (purchased from China Agriculture University) were incubated for 6 days after breeding at 37 C with 60% humidity