  D-Asp is present in vertebrates and invertebrates and is involved in the development of both the nervous and endocrine systems (Kim et al., 2010) .
<fluency>   D-Asp is present in vertebrates and invertebrates and is involved in the development of both the nervous and endocrine systems (Kim et al., 2010) .
 “ D-Asp is present in vertebrates and invertebrates and is involved in the development of both the nervous and endocrine systems (Kim et al., 2010) .