This set of repeats is found in a small family of secreted proteins of no known function, though they are possibly involved in signal transduction. ALF stands for Alanine-rich (AL) - conserved Phenylalanine (F).

1: New Knowledge from Old: In silico discovery of novel protein domains in Streptomyces coelicolor. Yeats C, Bentley S, Bateman A; BMC Microbiol 2003;3:3-3. PMID:12625841