From: Entrez Help
Entrez Help [Internet].
Bethesda (MD): National Center for Biotechnology Information (US); 2005-.
NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.
Figure 4.
The Protein Advanced Search interface showing the Search Builder and Search History. Entries from the Search Builder and the Search History can be combined in the Search Box to construct complex queries. Clicking on the numbered entries in the Search History provides Options for combining searches, removing History entries, loading results, showing queries, and saving the search in My NCBI. Combining #28 and #26 in the Search History with the protein name search for prolactin in the Search Builder finds the Xenopus tropicalis RefSeq protein for prolactin.