passages.id: split_4_test_2391_passage
passages.type: progene_text
passages.text: Analysis of genomic regions surrounding the Siglec-11 gene suggests that it is actually a chimeric molecule that arose from relatively recent gene duplication and recombination events , involving the extracellular domain of a closely related ancestral Siglec gene ( which subsequently became a pseudogene ) and a transmembrane and cytosolic tail derived from another ancestral Siglec .