Proteins that do not align with known amino acid sequences fall into two classes: (1) (conserved hypothetical, unknown function, mystery, non-critical) proteins are encoded by genes that have matches in the database but no function has yet been assigned to any of the sequences; (2) Proteins of (conserved hypothetical, unknown function, mystery, non-critical) function are the products of genes unique to that organism.
A. conserved hypothetical
B. unknown function
C. non-critical
D. mystery
Answer: A
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