High mol wt bFGF bands-repost

[N.Ambalavanan MD]

Hi! I'm doing Western blots for basic FGF on conditioned media from 
vascular smooth muscle cells passed through heparin sepharose columns
and then lyophilized and reconstituted. While the control bFGF shows 
bands at 18kD, the samples show multiple bands at 45, 66kD and these
bands persist even in reducing gels with DTT or 2-mercaptoethanol.
 I've tried two different primary antibodies and two secondary 
antibodies, but the problem persists. Amersham ECL technique is used 
for development. While higher mol.wt isoforms of bFGF do exist, the
highest they go to is 23-24kD.
	Does anyone have any ideas / suggestions?   Ambal MD