Robuta

https://www.proteomics.be/sars-cov-2-full-length-trimeric-spike-recombinant-antigen-w-b-1-351-rbd-mutation-south-african-variant/
sars covfull lengthtrimericspikerecombinant
https://www.rcsb.org/structure/5EIK
Structure of a Trimeric Intracellular Cation channel from C. elegans in the absence of Ca2+
cation channelrcsbpdbstructuretrimeric
https://www.ncbi.nlm.nih.gov/Structure/pdb/1KYC
SIN-GLU-GLU-LEU-ARG-ARG-ARG-ILE-GLU-GLU-LEU-GLU-ARG-ARG-ILE-ARG-NH2SUCCINIC ACIDSULFATE ION
crystal structurede novodesignedtrimeric