Summary
One of the earliest plasmin degradation products of human fibrinogen, so-called fragment
A, was isolated by a simple method.
This peptide has a molecular weight of approximately 22,500, migrating electrophoretically
at beta-area, and its amino acid composition shows a very high content of glycine,
serine, threonine and proline, and a markedly low content of hydrophobic amino acids.
This fragment does not react against anti-fibrinogen; however, the anti-serum of this
fragment reacts strongly with fibrinogen.