an R-cob(III)alamin(in) <=> an R-cob(III)alamin(out)
an r-cob(iii)alamin(in) <=> an r-cob(iii)alamin(out)
an R-cob(III)alamin(in) <=> an R-cob(III)alamin(out)
an r-cob(iii)alamin(in) <=> an r-cob(iii)alamin(out)