Bacterial cells simultaneously expressing two different<NOBR> fluorescent proteins (red and green) from identical promoters. </NOBR>

<NOBR> </NOBR><NOBR><o:p></o:p>

<NOBR>Because of stochasticity or noise in the process of gene </NOBR>

<NOBR>expression, </NOBR><NOBR>even two nearly identical genes often produce</NOBR>

<NOBR>unequal amounts of protein.</NOBR><NOBR><o:p></o:p>

<NOBR></NOBR>