| stem | The main stem or a branch of the main axial system of a plant, developed from the plumule of the embryo and typically bearing leaves. (09 Oct 1997) |
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| stem and loop structure | <molecular biology> The structure of tRNAs is so termed because it has four base paired stems and three loops (not base paired), one of which contains the anticodon. (18 Nov 1997) |
| stem bronchus | The main bronchus from which the branches of the bronchial tree arise. (05 Mar 2000) |
| stem cells | Relatively undifferentiated cells of the same lineage (family type) that retain the ability to divide and cycle throughout postnatal life to provide cells that can become specialised and take the place of those that die or are lost. (12 Dec 1998) |
| stem-clasping | <botany> Embracing the stem with its base; amplexicaul; as a leaf or petiole. Source: Websters Dictionary (01 Mar 1998) |
| infundibular stem | The neural component of the pituitary stalk that contains nerve tracts passing from the hypothalamus to the pars nervosa. Synonym: infundibular stalk. (05 Mar 2000) |
| tumour stem cells | <cell biology> Colony-forming cells which give rise to neoplasms. (12 Dec 1998) |
| bone marrow transplantation | <oncology, procedure> Treatment in which healthy bone marrow replaces bone marrow that has been affected by a disease or by treatment for a disease. Acronym: BMT (12 May 1997) |
| bone transplantation | The grafting of bone from a donor site to a recipient site. (12 Dec 1998) |
| brain tissue transplantation | Transference of brain tissue, either from a foetus or from a born individual, between individuals of the same species or between individuals of different species. (12 Dec 1998) |
| cardiopulmonary transplantation | The simultaneous, or near simultaneous, transference of heart and lungs from one human or animal to another. (12 Dec 1998) |
| pancreas transplantation | The transference of a pancreas from one human or animal to another. (12 Dec 1998) |
| pancreaticoduodenal transplantation | A technically feasible transplantation including both the duodenum and pancreas. (05 Mar 2000) |
| renal transplantation | Transplantation of a kidney from a compatible donor to restore kidney function in a recipient suffering from renal failure. (05 Mar 2000) |
| corneal transplantation | Partial or total replacement of the cornea from one human or animal to another. (12 Dec 1998) |