eutil classeseutil ,
einfo , esearch ,
esummary ,
efetch , elink ,
epost , egquery ,
espell , and
ecitmatch reference classes. This
object implements the low level request generator for
interaction with the NCBI services. It should not be used
direcly, but initialized through the respective
constructor functions einfo,
esearch, esummary,
efetch, elink,
epost, egquery,
espell, and ecitmatch.eutil(...)