White blood cells..Mammals only?

[Deborah O'Dell]

glover martin (gwmartin at scws30.harvard.edu) wrote:
> robertson jason vict (jroberts at ehsn12.cen.uiuc.edu) wrote:
> : Are white blood cells present in mammals only?  I came across a reference that

> No.  I know that at least birds have white cells also.

> : implied that they were.  If so, what do non-mammals use to defend against
> : microorganisms?

> I think that almost all metazoans (somebody stop me if I'm wrong) have at 
> least rudimentary phagocytic white cells.  And I think that in insects 
> these cells may also act as carriers of gas transport molecules.

> Trei


	Most vertebrates starting at the telost fish have some sort of
	leucocytes.
	
	Deborah
	
	>