| infraorbital region | The region of the face below the orbit and alongside the nose on each side. Synonym: regio infraorbitalis. (05 Mar 2000) |
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| infrascapular region | The region of the back lateral to the vertebral region and below the scapula. Synonym: regio infrascapularis. (05 Mar 2000) |
| inguinal region | The topographical area of the inferior abdomen related to the inguinal canal, lateral to the pubic region. Synonym: regio inguinalis, groin, iliac region, inguen. (05 Mar 2000) |
| intergenic region | <molecular biology> DNA sequences located between genes that comprise a large percentage of the human genome with no known function. (09 Oct 1997) |
| intermediate hypothalamic region | The infundibular portion of the hypothalamus, includes the medial tuberal nuclei and portions of the dorsomedial, ventromedial, arcuate (infundibular), posterior and lateral hypothalamic nuclei; located internally in the general area of the infundibulum. (05 Mar 2000) |
| I region | 1. The inducible gene region of the genome of E. Coli involved in the lactose operon. 2. Region of the murine genome coding for products involved in many aspects of the immune response (from Immune Region). most of the products are Class II histocompatibility antigens. (18 Nov 1997) |
| I region associated antigens | Class II major histocompatibility (MHC) antigens. (18 Nov 1997) |
| occipital region of head | The surface region of the head corresponding to the outlines of the occipital bone. Synonym: regio occipitalis capitis. (05 Mar 2000) |
| olfactory region of tunica mucosa of nose | The specialised olfactory receptive area that includes the upper one-third of the nasal septum and the lateral wall above the superior concha; it is lined with olfactory mucosa. Synonym: regio olfactoria tunicae mucosae nasi, olfactory region of tunica mucosa of nose, Schultze's membrane. (05 Mar 2000) |
| operator region | <genetics> DNA sequences which signal the initiation of transcription when derepressed. (12 Dec 1998) |
| oral region | The region of the face including the lips and mouth. Synonym: regio oralis. (05 Mar 2000) |
| orbital region | The region about the orbit. Synonym: regio orbitalis. (05 Mar 2000) |
| temporal region of head | The surface region of the head corresponding approximately to the outlines of the temporal bone. Synonym: regio temporalis capitis. (05 Mar 2000) |
| termination region | <molecular biology> A DNA sequence that signals the end of transcription. (13 Jan 1998) |
| early region | <molecular biology> Part of a viral genome in which early genes genes that are transcribed and expressed early during infection of a cell are clustered. (18 Nov 1997) |