CREATE TABLE table_54519 ("Species" TEXT, "Strain" TEXT, "Type" TEXT, "Base Pairs" FLOAT, "Genes" FLOAT)

How many genes in the species Rubrobacter Xylanophilus?
SELECT "Genes" FROM table_54519 WHERE "Species" = 'rubrobacter xylanophilus'
SELECT "Genes" FROM "table_54519" WHERE "Species" = 'rubrobacter xylanophilus'