<p>In the basement of a building down an alley here floats the future of bioengineered pets, and it is glowing.</p>
<p>In a corner, small fish flit about in a dozen aquariums. Bill Kuo, a manager at Taikong Corp., draws a thick curtain and switches on black lights over the tanks. Suddenly, the fish glow a bright green. "Imagine you come home from work, turn out the lights and look at these," Mr. Kuo says. "It's very relaxing."</p>
