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. 1977 Oct 1;167(1):245–253. doi: 10.1042/bj1670245

The subunit and polypeptide-chain structure of rabbit secretory immunoglobulin A. Isolation of a proteolytic fragment suitable for sequence studies on the variable region of alpha-chain.

A P Johnstone, L E Mole
PMCID: PMC1183642  PMID: 412497

Abstract

A method was developed for the preparation of a proteolytic fragment of rabbit secretory immunoglobulin A (sIgA) which contains the variable region of the alpha-chain; this fragment is suitable for primary-sequence studies. The serologically defined subclasses of sIgA are shown to correlate partially with the nature of the binding of a constituent chain of sIgA, called secretory piece. Data are also presented on the relative resistance of sIgA to enzymic and reductive cleavage, compared with immunoglobulin G.

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Selected References

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