abstracts and exporting from pubmed to bibtex

I've exported a number of references from a PubMed search to BibTeX with Zotero. I'm creating a pdf that displays my references along with their abstracts using the biblatex package.

However, some abstracts include subheadings like "Objective", "Background", "Methods", etc. The tags for these headings are included in the BibTeX file, even though they are not (as far as I know) standard BibTeX/LaTex syntax. The resulting pdf file then includes these tags verbatim, instead of using them to create subheadings within the abstract field.

For example, the BibTeX entry for http://www.ncbi.nlm.nih.gov/pubmed/17180130 includes things like this in the abstract field (I know \textless is BibTeX/LaTeX syntax):

{{{\textless}AbstractText} {Label="OBJECTIVE"} {NlmCategory="OBJECTIVE"{\textgreater}To}

which then get interpreted by LaTeX as

<AbstractText Label="OBJECTIVE" NlmCategory="OBJECTIVE">

Is there a way to get rid of these labels when importing from PubMed so that the abstracts are more readable?
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