ranjit_ece wrote:researchers have outlined a new set of studies for the treatment of breast cancer that is more comprehensive, focusing on multiple genes to identify several candidate therapeutic targets rather than profiling a single gene with the intention of targeting it alone.
in the above sentence
a) what does that modify
b) what does participial phrase focusing on multiple genes modify
The relative pronoun
that introduces essential information -- information needed to define the noun being modified.
The treatment of breast cancer does not need to be further defined. The definite article
the is used for a reason: a reader understands what is meant by
the treatment of breast cancer.
A new set of studies is not quite as defined. The indefinite article
a make us wait for more information. For this reason, a reader makes the connection:
a new set of studies...that is more comprehensive.
As noted above, a present participle preceded by a comma (such as
focusing) generally refers to the subject of the previous clause (
researchers): the
researchers are focusing on multiple genes.
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