R- and S-beta aminoisobutyrate and D- and L-serine pattern &#x7C; Cerebral spinal fluid &#x7C; Chemistry - non-challenge
r- and s-beta aminoisobutyrate and d- and l-serine pattern &#x7c; cerebral spinal fluid &#x7c; chemistry - non-challenge
R- and S-beta aminoisobutyrate and D- and L-serine pattern &#x7C; Cerebral spinal fluid &#x7C; Chemistry - non-challenge
r- and s-beta aminoisobutyrate and d- and l-serine pattern &#x7c; cerebral spinal fluid &#x7c; chemistry - non-challenge