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)