CREATE TABLE "nomenclature_of_t3_ss_proteins" (
  "function_genus" text,
  "shigella" text,
  "salmonella" text,
  "yersinia" text,
  "escherichia" text
);

Question:  how many ↓ function / genus → with escherichia being espd
SQL: SELECT COUNT("function_genus") FROM "nomenclature_of_t3_ss_proteins" WHERE "escherichia"='EspD';

Question: what's the salmonella with escherichia being espd
SQL: SELECT "salmonella" FROM "nomenclature_of_t3_ss_proteins" WHERE "escherichia"='EspD';

Question: what's the ↓ function / genus → with shigella being spa32
SQL: SELECT "function_genus" FROM "nomenclature_of_t3_ss_proteins" WHERE "shigella"='Spa32';

Question: what's the salmonella with shigella being ipgc
SQL: SELECT "salmonella" FROM "nomenclature_of_t3_ss_proteins" WHERE "shigella"='IpgC';

Question: what's the salmonella with escherichia being sepb (escn)
SQL: SELECT "salmonella" FROM "nomenclature_of_t3_ss_proteins" WHERE "escherichia"='SepB (EscN)';

Question: what's the shigella with yersinia being yscp
SQL: SELECT "shigella" FROM "nomenclature_of_t3_ss_proteins" WHERE "yersinia"='YscP';