The domain within your query sequence starts at position 20 and ends at position 28; the E-value for the Hormone_4 domain shown below is 1.4e-6.

CYIQNCPLG

Hormone_4

Hormone_4
PFAM accession number:PF00220
Interpro abstract (IPR022423):

Oxytocin (or ocytocin) and vasopressin [(PUBMED:3147712)] are small (nine amino acid residues), structurally and functionally related neurohypophysial peptide hormones. Oxytocin causes contraction of the smooth muscle of the uterus and of the mammary gland while vasopressin has a direct antidiuretic action on the kidney and also causes vasoconstriction of the peripheral vessels. Like the majority of active peptides, both hormones are synthesized as larger protein precursors that are enzymatically converted to their mature forms. Peptides containing this conserved site are also found in birds, fish, reptiles and amphibians (mesotocin, isotocin, valitocin, glumitocin, aspargtocin, vasotocin, seritocin, asvatocin, phasvatocin), in worms (annetocin), octopi (cephalotocin), locust (locupressin or neuropeptide F1/F2) and in molluscs (conopressins G and S) [(PUBMED:7591488)].

GO component:extracellular region (GO:0005576)
GO function:neurohypophyseal hormone activity (GO:0005185)

This is a PFAM domain. For full annotation and more information, please see the PFAM entry Hormone_4