Amino acid content (µg/mg of isolated pigment) ± standard error of the mean (sem).

aIn parentheses the number of analyzed samples per brain area.bMean of total amino acidic content of each sample (each value in this table has been approximated to the first decimal place).a 括号内数值为每个脑区的分析样本数量。 b 表示各样本的总氨基酸含量均值（本表中所有数值均已近似至小数点后一位）。