And there are tantalizing hints that they might play a role in all sorts of diseases.
FORBES: Government Unveils First Map Of All The Germs In The Human Body
Others might play a new guitar for a year or more before taking it on the road.
Certain inherited DNA mutations might play a role, as well as chemicals in our environment or diet.
The role of mental outlook on cancer remains controversial, with some studies suggesting that it might play a role.
One possibility is that Henman might play a smaller part and allow a chance in the reverse singles against Udomchoke.
Many Libyans were concerned that a free Gadhafi might play a role in destabilizing Libya in the future, he said.
CNN: Celebrations erupt in Libya amid news of Gadhafi's death
For example, a Bravia flatscreen television might play a movie from one of the company's studios as customers walk by.
Tax increases might play a minor role, clearing out foolish, wasteful and distorted taxes, but this is not the major solution.
FORBES: Mr. President & Congress: Stop Looking For An Easy Way Out -- There Isn't One!
Writing in the journal Nature, researchers from the Geological Survey of India suggest that the increasing use of phosphate fertilisers might play a part.
Doctors have suspected that diet might play a role in the trend, which is seen throughout the world and associated with prosperous urban lifestyles.
Turns out though that CFLs might play a role in cancer, calling into question how we mandate innovation but also how we report novelty.
FORBES: More Concerns About Cancer and Energy Saving Light Bulbs: Justified?
Some witnesses before the committee suggested the police might play a role in assessing whether donors' perception that they may be under risk was based on reality.
In most cases, parents themselves might play a role on a new school's governing body but would not be involved in teaching or the running of a school.
The governments of sending countries might play a role too: Harvard's Mr Rodrik suggests giving them a quota for migrants that is reduced by the numbers that fail to return on time.
It is staggering how often well-educated and well-meaning members of our profession fail to engage the disenfranchised in constructive conversations about what they need and how society might play a role in empowering them.
"The framing of the issue by the media might play a role, but it is impossible to say what will be the consequences of the media attacking the far right versus tacitly ignoring it, " he said, referring to the approach taken by Greek media so far.
Collaborating with colleagues in the U.S. in the mid-1990s, the Terlings Park researchers were the first to show that substance P might play a role in depression, when they noticed that guinea pigs cried out in alarm when compounds similar to substance P were injected into their brains.
But no one suspected that recombination might also play a role in generating new species.
Girardi said SS Derek Jeter might play in a minor league game Saturday as the DH, depending on how his ankle feels.
But they might still play a part in who goes down from Division One after dominating day two against relegation-threatened Lancashire at Taunton.
The doomsday scenario for Italy coming in was that Croatia and Spain might play to a 2-2 gentlemen's draw, virtually assuring that each of them would go through.
Microbes might even play a role in mental illness.
FORBES: Government Unveils First Map Of All The Germs In The Human Body
Who knows, if the Yankees Alex Rodriguez, maybe they might make a play.
Liverpool boss Rafael Benitez will surely instruct his players to keep it tight for 55-60 minutes and then you might see them play a bit more adventurously after that.
Nearterm might be a nice play because of these new product launches, but EBITDA at 1.7% is poor in our view.
He has been very confident in his remarks of late saying that perhaps Sheikh Sharif might be able to play a role in the reconciliation.
Under different circumstances (say, in a novel or a play), the script might be described as a comedy of errors.
Finding themselves in a legally precarious position, sites like Yelp might opt to play it safe by removing a great deal of content and communications that could have real social value.
Right now a computer might play Jeopardy, but it knows nothing about playing chess.
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