The function of this family of proteins, CYTL1, has not, as yet, been determined. However it is thought to be a secretory protein expressed in CD34+ haemopoietic cells [1]. This family of proteins is found in eukaryotes. Proteins in this family are typically between 134 and 145 amino acids in length. There are two conserved sequence motifs: PPTCYSR and DDC.

1: Molecular cloning and chromosomal mapping of a candidate cytokine gene selectively expressed in human CD34+ cells. Liu X, Rapp N, Deans R, Cheng L; Genomics. 2000;65:283-292. PMID:10857752