1.   A membrane selectively permeable to gases separates the buffer from the blood sample.

2.   A second showed Fung carrying a garbage bag containing the blood sample to his van.

3.   He compared the samples with a blood sample from Mr Green.

4.   It does not even include the taking of a blood sample.

5.   The blood sample, if drawn outside Stanford, can be transported to the Palo Alto-based medical center by courier.

6.   The blood samples are being sent out for independent analysis.