The next most common type, the beta bulge loop, also occurs in antiparallel sheet, but one residue has the alphaL conformation, giving rise to a beta turn or alpha turn, such that the motif sometimes forms the loop of a beta hairpin.
The next most common type, the beta bulge loop, may also occurs in antiparallel sheet, but also elsewhere. One residue has the α Subscript text L conformation and is part of a beta turn or alpha turn, such that the motif sometimes forms the loop of a beta hairpin.