Molecular biology ( /məˈlɛkjʊlər/) is the branch of biology that deals with the molecular basis of biological activity. This field overlaps with other areas of biology and chemistry, particularly genetics and biochemistry. Molecular biology chiefly concerns itself with understanding the interactions between the various systems of a cell, including the interactions between the different types of DNA, RNA and protein biosynthesis as well as learning how these interactions are regulated.

Writing in Nature in 1961, William Astbury described molecular biology as

Researchers in molecular biology use specific techniques native to molecular biology but increasingly combine these with techniques and ideas from genetics and biochemistry. There is not a defined line between these disciplines. The figure above is a schematic that depicts one possible view of the relationship between the fields:

Much of the work in molecular biology is quantitative, and recently much work has been done at the interface of molecular biology and computer science in bioinformatics and computational biology. As of the early 2000s, the study of gene structure and function, molecular genetics, has been among the most prominent sub-field of molecular biology.

Drew Berry (born 1970 in USA) is a biomedical animator at the Walter and Eliza Hall Institute of Medical Research in Melbourne, Australia. His scientifically accurate and aesthetically rich visualizations are elucidating cellular and molecular processes for a wide range of audiences. His animations have been shown in exhibitions, multimedia programs and television shows, and have received international recognition including an Emmy (2005) and a BAFTA Award (2004).

Berry received a Bachelor of Science (1993) and Master of Science (1995) degrees from the University of Melbourne, and received training in cell biology as well as in light microscopy and electron microscopy.

Since 1995, Berry has been a biomedical animator at the Walter and Eliza Hall Institute of Medical Research. His 3D and 4D animations have focussed on explaining cellular and molecular processes relevant to research conducted at the institute, in fields including molecular biology, malaria, cell death, cancer biology, hematology and immunology.