passages.id: split_5_test_2497_passage
passages.type: progene_text
passages.text: This 300 - 400 kDa glycoprotein is composed of conserved peptide motifs : 14 SRCR domains that are separated by SRCR - interspersed domains ( SIDs ) , 2 CUB ( C1r / C1s Uegf Bmp1 ) domains , and a zona pellucida domain .