May function in innate immunity through activation of the lectin complement pathway. Calcium-dependent and GlcNAc-binding lectin (By similarity). Homotrimer. Interacts with elastin. Interacts with MASP1 and MASP2. Mainly expressed in skeletal muscle. The fibrinogen-like domain (FBG) contains calcium-binding sites that may be involved in carbohydrate binding. Belongs to the ficolin lectin family.