Data: Information manipulated by a computer program

Database: A collection of data arranged for ease and speed of search and retrieval. Also called data bank.

Data mining: The use of automated data analysis techniques to uncover previously undetected relationships among data items.

Data type: A description of a variable defined by two properties: a domain, which is the set of values that belong to that type, and a set of operations, which defines the behavior of that type.

DNA sequence: The relative order of base pairs in any sample of DNA, whether in a DNA fragment, a gene, a chromosome, or an entire genome

Domain (protein): A region of special biological interest within a single protein sequence. However, a domain may also be defined as a region within the three-dimensional structure of a protein that may encompass regions of several distinct protein sequences that accomplishes a specific function. A domain class is a group of domains that share a common set of well-defined properties or characteristics.

Disulphide bond: Covalent link formed between the sulphur atoms of two different cysteine residues in a protein. Important in maintaining the folded structure of a protein, and also for linking different proteins in a complex.