sarcoma virus, feline (medicine) and precursor (iou)

sarcoma virus, feline (medicine)

sarcoma virus, feline

A species of mammalian type c retroviruses (retroviruses type c, mammalian) isolated from fibrosarcoma in cats. The virus is actually a recombinant feline leukaemia virus (felv) where part of the genome has been replaced by cellular oncogenes. It is unique to individuals and not transmitted naturally to Other cats. Fesv is replication defective and requires felv to reproduce.

precursor (iou)

precursor noun & adjective. LME.
[Latin praecursor, from praecurs- pa. ppl stem of praecurrere run before, precede, from prae PRE- + currere run: see -OR.]
A. noun.
A person who or thing which precedes another as a forerunner or presage; a person who or thing which heralds the approach of someone or something else, a harbinger. LME.
E. H. Erikson Infantile fears..are the precursors of many..anxieties entertained by adults A. N. Wilson There is no evidence that Jesus, or his precursor John, taught pacifism as such.
A predecessor. L18.
M. Arnold Cowper..by his genuine love of Nature was a precursor of Wordsworth A. C. Clarke A score of ships..each with more advanced technology than its precursor.
a. A substance, esp. a naturally occurring one, from which another is formed by metabolism, decay, or Other (esp. chemical) process. L19.
Scientific American Ozone and its precursor, atomic oxygen, are destroyed by catalytic reactions.
b. Biology. A cell which precedes another in a process of differentiation. E20.
b. attrib. or as adjective. That is a precursor. M19.
precursorship noun (a) the status or function of a precursor; (b) antecedence, prior occurrence: M19.

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