Responding to questions about whether Bush was present for all required duty during his time in the Air National Guard in the early 1970s, the White House on Friday released what Bush aides said were all documents relating to the president's service.

CNN: Bush campaign set to turn up the heat

The green fluorescent protein was originally used to discover whether genes were present at all.

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"The length of time a person has been infected before treatment, whether the patient has been given sufficient treatment, and whether there are co-infections present, can all have a big impact on a patient's recovery, " it says.

BBC: Areas of woodland can harbour ticks