https://www.ncbi.nlm.nih.gov/Structure/pdb/6PZ8
G2 heavy chainG2 light chainS protein2-acetamido-2-deoxy-beta-D-glucopyranosealpha-D-mannopyranosebeta-D-mannopyranose
variable domainmerstrimercomplex
https://www.lulu.com/shop/nganku-junior/on-an-alternative-approach-to-the-decomposition-of-the-domain-of-a-function-of-a-single-variable/paperback/product-1zzrp8y.html
the analysis of the real nature of a function of a single variable
alternative approachdecompositiondomain