51.   Another area of microbial studies centers on fossils.

52.   Another disagreement centered on how to subsidize health insurance for people who lack coverage.

53.   Another unresolved issue reportedly centers on where armed settlers have the right to move in the city.

54.   Another centered on a junkie, a priest and a church official, one of whom is killing people.

55.   Any attention that centers on me and not the team is uncomfortable.

56.   Another argument over corridors centers on Gorazde, now a Muslim enclave in eastern Bosnia.

57.   Another difference is an increase in campaigns centered on promotions and public relations rather than expensive mass media ads.

58.   Another initiative would center on building a squadron of small high-speed warships that, in battle, could be tightly linked by information technologies but physically dispersed.

59.   Arguments over the use of DNA evidence in court have centered on two issues.

60.   Arguments in the White House have centered on how intrusive a role Clinton should play in easing the pain.