Assertion: t lymphocyte | /r/HasProperty | either cd4
Facets:
Source sentences:
text: However, a lack of specificity of the immunophenotype led to the development of the T cell receptor excision circle (TREC) assay in which the proportion of T lymphocytes, either CD4 or CD8, which contain TREC are quantified (Douek et al., 1998; 2000).