 There are two major types of D-amino acids synthesized in mammals: D-aspartic acid (D-Asp) and D-serine (D-Ser).
<fluency>  There are two major types of D-amino acids synthesized in mammals: D-aspartic acid (D-Asp) and D-serine (D-Ser).
 The two major types of D-amino acids synthesized in mammals: D-aspartic acid (D-Asp) and D-serine (D-Ser).