1.   But the cell must already have an internal system which can respond to such signals and again the signal is being selective.

2.   In face-to-face meetings all the visual signals are a great aid to getting on the same wavelength with some one.

3.   Signals are the means by which drivers warn other road users, including pedestrians and cyclists, of their intentions and presence.

4.   The signals were too weak for the receiver to pick up.

5.   There had been other signals along the way.

6.   This signal can be either excitatory or inhibitory.

7.   The analogue signal was stored in digitised form on a computer hard drive.

8.   It was not possible to confirmthat the immunoreactive signal in serum was due to APGPR but the immunoreactive signal in urine coeluted with synthetic APGPR.