to determine whether the molecular configuration of vitamin b ( 12 ) influences the attachment of intrinsic factor-vitamin b ( 12 ) complex to ileal microvillous membrane receptor sites , we have examined the kinetics of uptake of intrinsic factor-bound cyanocobalamin by brush borders and microvillous membranes isolated from guinea pig ileum , and have compared this uptake with that of intrinsic factor alone and with that of intrinsic factor complexed with various analogs of cyanocobalamin .
C1874943
intrinsic
C0021918
intrinsic factor