Bacteriophage capsid protein shell. Molecular model showing the partial shell structure of a bacteriophage capsid based on one of its coat proteins. The coat protein is P3, and the bacteriophage is PRD1. Bacteriophages are viruses that infect bacteria. PRD1 infects enterobacteria. This model, known as the P3-shell, lacks the internal membrane and proteins occupying the vertices (empty areas) in the complete capsid structure.
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