1. School of Biological Sciences; University of the Punjab, Quaid-i-Azam Campus; Lahore 54590 Pakistan
2. Institute of Life Sciences; Swansea University Medical School, Singleton Park, Swansea; Wales United Kingdom
3. Department of Biochemistry; King Abdul Aziz University; Jeddah, Kingdom of Saudi Arabia
4. Department of Zoology, College of Science; King Saud University, P. O. Box 2455; Riyadh 11451, Kingdom of Saudi Arabia