To watch coverage of a forum with Dr Panos Zavos, please click here:
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Dr Antinori goes into the Washington meeting with a warning from medical authorities that he risks losing his right to practise in Italy because of his plans to copy humans.
The NA panel which is looking into all aspects of cloning - as a way to develop new therapies and improve agricultural livestock - hopes to produce a report for public discussion by the end of the year.
UFO group
By this time, Drs Zavos and Antinori hope to have started their cloning programme.
"We are considering 200 couples," Dr Zavos said on the eve of the NA meeting. "That doesn't mean that 200 couples will be cloned immediately. They will be considered as such. We will start with the first one, we'll finish with the 200th one, eventually, but it's not going to happen all in November."
Drs Zavos and Antinori will share a platform with Dr Brigitte Boisselier, a biochemist and member of a UFO group known as the Raelians. The group, which believes in extraterrestrials and promotes cloning as a chance for "eternal life", defended its intentions to pursue the technology in a statement on Monday.
The group, which has a company called Clonaid, said copying humans would eventually become as acceptable as producing them in a test tube (in vitro). It said the appearance of Dr Boisselier before the NA panel was important because "it shows that the scientific community is interested in a more objective view on this subject than the politicians".
European law
Dr Antinori flew into Washington after receiving a warning from the vice president of Rome's medical association that he could be barred from practising altogether if he carried through his cloning plans.
"He is risking not being allowed to practice medicine in this country (Italy)," Mario Falconi said, adding that Dr Antinori had already been asked to appear before the association's governing council.
Italy's medical code stipulates that medical experimentation is only allowed for the prevention and correction of medical problems. Cloning is also prohibited under a Council of Europe convention that came into force in March.
But Dr Antinori believes he has to counter what he describes as "an illogical fear" of cloning. "For me it's an illogical fear because, in reality, it's just therapeutic cloning to give the opportunity to millions of men in the world to become fathers. [Tuesday's] meeting is a good opportunity to explain. The public will understand and will change the opinion to positive."
Still births
The NA panel is holding a day of interviews and debate that will feed into its public discussion document to be published in four months.
The panel will assess the current state of cloning technology and whether it is advanced enough to be used safely in humans. It will hear from many leading authorities, including Professor Ian Wilmut, the UK researcher who led the team that produced Dolly the Sheep clone.
He has already said that the technology pioneered in Dolly, the first vertebrate to be cloned from an adult mammalian cell, would be too dangerous to use on humans at the moment.
The likelihood, he wrote in a recent scientific paper, is that attempts to clone humans would result in many miscarriages, still births and deformities.