Table 1.

Biochemically active prokaryotic and eukaryotic DNA helicases reported so far

S. No.	Organism	Number reported so far
1.	Escherichia coli	14
2.	Bacteriophage	6
3.	Parasites (Plasmodium)	2 (one from Plasmodium cynomolgi and one from Plasmodium falciparum)
4.	Virus	12
5.	Yeast	15
6.	Plant	10 (including three from chloroplast)
7.	Calf thymus	11
8.	Human	25
9.	Frog	1
10.	Mouse/rat	3
11.	Drosophila	4