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1. Locate the RefSeq record for SARS-Cov-2

A. Locate the sequence of the spike protein ā€œSā€ in the record. What are the values of the CDS coordinates, /product keyword, and the protein_id?

B. Find the structure of the S protein in the PDB (MMDB).

C. How many x-ray structures of this protein are available in the database?

D. What is the stoichiometry of the S protein in the biological assembly?

E. (Extra credit) Include a screenshot of the biological assembly such that all polypeptides in the complex are shown in distinct colors.