Complex sentence: This kind of collagens have a single pass hydrophobic transmembrane domain, belonging to the type II transmembrane proteins group, although α-1 (XXIII) molecule can be found either in membrane-bond form or in shed form.
Split into simpler sentences: This kind of collagens have a single pass hydrophobic transmembrane domain. Collagen α-1 (XXIII) can be found either in membrane-bond form or in shed form.