Mass spectral data for a sample of the first migrating band after purification.

<p>(A) HPLC trace showing a single peak, (B) MS profile suggesting that two proteins co-eluted. The charge envelopes were deconvoluted to give molecular masses of 14,730 Da (minor protein) and 14,810 Da (major protein). The molecular mass of the minor protein matches that of GP-9B considering the formation of the three disulfide bridges.