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

3dmet
afcs
amaze
aracyc
beilstein
bigg
bind
bind smid
biogrid
brenda
cas
ccsd
cell ontology
chebi
chembl
chemspider
complex portal
complexportal
corum
dip
drugbank
ec
ecocyc
eg
embl
emdb
ensembl
ensemblgenomes
entrez-gene
genbank
genbank identifier
genbank_protein_gi
glycoepitope
glytoucan
go
het
hmdb
hmdb metabolite
imex
innatedb
intact
interpro
ipi
jcggdb
kegg
kegg glycan
knapsack
ligand
lipidbank
lipidmaps
matrixdb
mdl
merck index
metabolights
mgd
mgi
mgi-id
mgi-symbol
mim
mint
mips
mousecyc
ncbi nucleotide
ncbi-proteinid
ncbi_protein
nci
nikkaji
omim
pdb
pdb-ccd
pdbe
pfam
phosphositeplus
prf
pride
psi-mi
pubchem
pubchem-compound
pubchem-substance
pubmed
rcsb pdb
reactome
refseq
ricecyc
rnacentral
tissue list
um-bbd-cpd
umbbd
uniprot
uniprot knowledge base
vega
wikipedia
wwpdb