Data from different studies may not reflect the true inherent difference of samples as the measuring and calculation methods for chain length of diverse chain categories can have a great influence on the values. This may be reflected by the fact that the structural difference between four genotypes of diverse species in one study (Annoret al., 2014a) was much smaller than that between data from different studies (Annoret al., 2014a; Gaffa et al., 2004; Madhusudhan & Tharanathan, 1996).