“…Some researchers have combined different feature extraction methods and achieved very good classification results (Dehzangi et al, 2013; Zou et al, 2014; Leyi et al, 2015, 2018; Chen X. et al, 2016; Ding et al, 2016, 2017a,b; Li et al, 2016; Chen et al, 2017,a,b, 2018c,d,e; Su et al, 2018 Shen et al, 2019; Wei et al, 2019; Zhu et al, 2019). Wei et al (2015) proposed a novel feature extraction method that uses both the profile of PSI-BLAST (Altschul et al, 1997) and the profile of PSI-PRED (Jones, 1999), which contain rich evolutionary information and secondary structure information, respectively.…”