Complex sentence: Concentration used depends on the strength of induction required, as well as the genotype of cells or plasmid used-if "lacI q", a mutant that over-produces the lac repressor, is present, then a higher concentration of IPTG may be necessary.
Split into simpler sentences: Concentration used depends on the strength of induction required, as well as the genotype of cells or plasmid used. If "lacI q", a mutant that over-produces the lac repressor, is present, then a higher concentration of IPTG may be necessary.