kinetic analysis of the polyamine uptake system present in macrophages showed putrescine uptake consisted of a saturable ( km = 2.1 microm ) and nonsaturable component whilst spermidine uptake consisted of both a high- and a low-capacity saturable component ( km = 0.16 microm and 1.97 microm , respectively ) .
C0034170
putrescine
C0037871
uptake