2kk1

2kk1 is a four-character alphanumeric string that can serve as an identifier in a variety of databases, catalogs, and software systems. Codes of this form are widely used because they are concise and easy to index. In practice, the precise meaning of 2kk1 depends on the registry in which it appears, and some systems distinguish letter case (for example, uppercase vs lowercase), while others normalize identifiers for lookup.

In biological databases, four-character IDs are commonly used to label macromolecular structures. The Protein Data Bank (PDB), for instance, assigns four-character codes to individual entries. If 2KK1 has been allocated as a PDB ID, it would designate a single structure and would be accompanied by metadata such as authors, journal citation, experimental method, resolution, and coordinate files. The entry would also link to related data such as sequence information and related materials. Note that not every four-character combination is guaranteed to correspond to an existing entry; some are unused or reserved.

Outside biology, 2kk1 might function as a product model number, project code, software build tag, or internal catalog identifier. Because it is not unique to one domain, the exact meaning of 2kk1 must be inferred from context. To determine its reference, locate the code in the relevant database or document and perform a targeted search, checking for capitalization variants or concatenated forms such as 2KK1.