What is the aa length when the protein name is c11orf73?
CREATE TABLE "orthologs" (
  "species" text,
  "common_name" text,
  "protein_name" text,
  "accession_number" text,
  "nt_length" text,
  "nt_identity" text,
  "aa_length" text,
  "aa_identity" text,
  "e_value" text
);
SELECT "aa_length" FROM "orthologs" WHERE "protein_name"='C11orf73';