A cDNA encoding the ovine hematopoietic growth factor interleukin-3 (I
L-3), has been cloned. A 560-bp cDNA, containing the entire protein co
ding region, was amplified from activated mesenteric lymph node cells.
The cDNA was found to share 58% nucleotide identity with hIL-3 and 48
% identity with mIL-3. The predicted ovine amino-acid sequence shares
36 and 30% identity, respectively, with the corresponding human and mu
rine proteins.