SIGLEC1 (Sialic Acid Binding Ig-Like Lectin 1): SIGLEC1 is a protein, also known as sialoadhesin or CD169, that belongs to the family of I-type lectins. It recognizes sialic acid residues on cell surfaces and is primarily expressed on macrophages. SIGLEC1 plays important roles in cell-cell interactions, binding to sialylated pathogens, and modulating immune responses. It is involved in immune surveillance and has been linked to the development of infectious diseases and some cancers.