You can use Entrez Gene ID (e.g. 7157), gene symbol (e.g. TP53), gene name (e.g. tumor protein p53), gene synonyms (e.g. FLJ92943), Ensembl ID (e.g. ENSG0000141510), and RefSeq Accession (e.g. NM_000546) to take the search. Species can be input after the keyword, using format "keyword [species:$species]" where $species can be name of species (like human or rat) or taxon id (like 9606). It is highly recommended to select the species to speed up the search.