By Peter Rutherford
DAEGU, South Korea (Reuters) - The United States won the women's 4x100 meters relay title at the world championships on Sunday, Carmelita Jeter bringing the anchor leg home in a time of 41.56.
Defending champions Jamaica took second place in 41.70 and Ukraine claimed the bronze medal in 42.51.
Bianca Knight ran the first leg for the United States before Allyson Felix powered down the back straight and handed over to Marshevet Myers.
Jeter, the individual 100 meters champion, took the baton with a slight lead and held off Veronica Campbell-Brown to give the Americans the gold.
"It's been great, I'm very excited going into London 2012, it gives me a lot of motivation to go training for next year," said Jeter.
"I'm excited to run with these ladies tonight, they ran exceptional legs, they did the job, we had confidence in each other."
It was the third 4x100 relay title for the United States in the last four championships after Jamaica had taken the title in Berlin two years ago.
Felix had come to Daegu targeting an unprecedented 200-400 world double but finished runner-up to Botswana's Amantle Montsho in the 400 and saw Campbell-Brown take her 200 title.
"I'm happy, it was an honor to run with these women tonight," said an exhausted Felix. "I just wanted to keep up ... I've been working on adrenaline just to keep up with the team."
(Editing by Ed Osmond)