Complex sentence: Even when cultured in a Fe 3 + deficient medium, MTB succeed at accumulating high intracellular concentrations of this ion by secreting, upon need, a siderophore, a low molecular weight ligand displaying an elevated affinity for Fe 3 + ions.
Split into simpler sentences: Even when cultured in a Fe 3 + deficient medium, MTB succeed at accumulating high intracellular concentrations of this ion. It has been suggested that they accomplish this by secreting, upon need, a siderophore, a low molecular weight ligand displaying an elevated affinity for Fe 3 + ions.