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A competitive indirect enzyme-linked immunosorbent assay (ELISA) was developed for the rapid quantitation of the glycosylated and deglycosylated forms of the monomeric soluble extensin precursor subunits P1 and P2. A log-linear response range for each kind of precursor in the competition curve was between 0.01 and 100 nanograms per milliliter.
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Conrad et al. (1987) studied this question.
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