Arabinan

(→5)-α-L-arabinofuranose(1→) with random α-L-arabinofuranose(1→3) side chain [3]. The enzymatically debranched arabinan is called araban [3].

As lipoarabinomannan (LAM) the branches are (ß-Araf(1→2), (→6)-α-L-Araf(1→) or (→6)-α-Manp(1→5)-α-L-Araf(1→3) with further branching as (→2)-α-Manp(1→). The LAM is classified into two types, depending on the presence of a Manp at the nonreducing end of the oligoarabinosyl side chain [4].