L23

L23 is a designation used in multiple domains, and its meaning depends on the field. In biology it most commonly refers to a ribosomal protein, while in medicine and other industries it denotes codes and model numbers. The term therefore requires context to identify the intended reference.

In biology, L23 is a ribosomal protein of the 50S large subunit found in many bacteria. It is a relatively small, basic protein that sits near the polypeptide exit tunnel of the ribosome and participates in the early stages of translation and ribosome assembly. L23 is conserved across diverse bacterial species, though its exact sequence and size can vary. Structural and functional studies describe L23 as contributing to the organization of the exit path through which nascent chains emerge, and it can interact with ribosomal RNA and other ribosomal proteins. Variations in L23 can influence ribosome dynamics and efficiency, and its presence is often noted in studies of ribosome structure and function.

In medicine, L23 appears in medical coding systems such as the ICD-10-CM classification, where it denotes allergic contact dermatitis in a broad coding scheme. Subcodes extending from L23 specify sites, allergens, or clinical presentations, and the code is used in medical records, billing, and epidemiological tracking.

Beyond these uses, L23 also serves as a generic designation in various industries for model numbers, part identifiers, or catalog entries. The precise meaning of L23 in such cases is product- or context-specific and cannot be inferred from the label alone.