user: Question: What is the lowest number of genes in Rubrobacter xylanophilus?
Columns: ['Species', 'Strain', 'Type', 'Base Pairs', 'Genes']
Types: ['text', 'text', 'text', 'real', 'real']
Sample row: ['Acidobacteria bacterium', 'Ellin345', 'Acidobacteria', 5650368.0, 4777.0]
SQL:

assistant: SELECT MIN("Genes") FROM "Table" WHERE "Species" = 'Rubrobacter xylanophilus';