Identifier types that can be used for a physical entity search:

3dmet
amaze
aracyc
beilstein
bigg
bind
biocyc
biogrid
cas
cazy
ccsd
chebi
chembl
chemspider
cyc2008
cygd
dip
disprot
drugbank
ec
ecocyc
embl
emdb
ensembl
ensemblgenomes
entrez
entrez-gene
enzyme-db
eupathdb
genbank
genbank identifier
genbank_nucl_gi
gene3d
gi
glytoucan
go
het
hmdb
hmdb metabolite
imex
intact
intenz
interpro
jcggdb
kegg
kegg-glycan
knapsack
lipid_maps
lipidbank
lipidmaps
mdl
merck index
metabolights
mint
mips
ncbi-proteinid
nci
nikkaji
panther
pdb
pdb-ccd
pdbe
pfam
pid-gene
pin
pride
prints
prodom
prosite
proteinmodelportal
psi-mi
pubchem
pubchem-compound
pubchem-substance
pubmed
rcsb pdb
reactome
refseq
ricecyc
rnacentral
sgd
sgd-id
smart
smr
string
um-bbd-cpd
umbbd
uniprot
wwpdb
yeastcyc