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Fig. 2. HPLC purification of the S2-like immunoreactive peak 3 from Echinus
esculentus. Seven HPLC steps were required to purify this peak and the
final chromatogram is shown here. The S2-like immunoreactivity elutes in four
fractions corresponding to a single peak of absorbance at 210 nm and amino
acid sequencing of these fractions yielded the partial sequence MRYH.