The domain within your query sequence starts at position 1 and ends at position 273; the E-value for the SCF domain shown below is 2.3e-157.

MKKTQTWIITCIYLQLLLFNPLVKTKEICGNPVTDNVKDITKLVANLPNDYMITLNYVAG
MDVLPSHCWLRDMVIQLSLSLTTLLDKFSNISEGLSNYSIIDKLGKIVDDLVLCMEENAP
KNIKESPKRPETRSFTPEEFFSIFNRSIDAFKDFMVASDTSDCVLSSTLGPEKDSRVSVT
KPFMLPPVAASSLRNDSSSSNRKAAKAPEDSGLQWTAMALPALISLVIGFAFGALYWKKK
QSSLTRAVENIQINEEDNEISMLQQKEREFQEV

SCF

SCF
PFAM accession number:PF02404
Interpro abstract (IPR003452): Stem cell factor (SCF) is a homodimer involved in hematopoiesis. SCF binds to and activates KIT, a receptor tyrosine kinase [(PUBMED:17662946)]. SCF stimulates the proliferation of mast cells and is able to augment the proliferation of both myeloid and lymphoid hematopoietic progenitors in bone marrow culture. It also mediates cell-cell adhesion and acts synergistically with other cytokines. SCF is a type I membrane protein, but is also found in a secretable, soluble form. The crystal structure of human SCF has been resolved and a potential receptor-binding site identified [(PUBMED:10884405)].
GO process:cell adhesion (GO:0007155)
GO component:membrane (GO:0016020)
GO function:stem cell factor receptor binding (GO:0005173)

This is a PFAM domain. For full annotation and more information, please see the PFAM entry SCF