FALP preparations contain fibrinogen fragments.

FALP was prepared from normal human plasma as described in “Methods” and subjected to SDS-PAGE under nonreducing conditions (left lane, NR) and reducing conditions (right lane, R). Gels were electrophoretically transferred to a PVDF membrane and stained with Coomassie Blue. Bands in NR appeared identical to those reported previously12 and the previously identified bands are labeled. Four bands from the reduced lane were excised and analyzed for N-terminal amino acid sequence. The sequencing results are shown to the right of the band. Molecular weight markers are shown in kilodaltons.