1.   Technology has helped obscure the line with cellular telephones, fax machines, e-mail and the Internet, which make people always available.

2.   The show includes suspects both usual and not, and often obscures the line between art and archive.

3.   The ties between the various parties, he said, obscured lines of fiduciary duty.

4.   Unlike the other chromosomes, the genetic material on the Y chromosome is not shuffled every generation, obscuring the lines of individual descent.