Figure 7. Total protein concentration in CSF of various species at different post‐conceptional ages.

Ordinate: total protein concentration mg (100 mL CSF)⁻¹. Abscissa: post‐conceptional age in days. Filled circles indicate time of birth. Data for sheep from Dziegielewska et al. (1980a); pig (Cavanagh et al. 1982); rat (Dziegielewska et al. 1981; Checiu et al. 1984); tammar wallaby, Macropus eugenii (Dziegielewska et al. 1986); opossum, Monodelphis domestica (Dziegielewska et al. 1989); chick, (Birge et al. 1974); rabbit (Ramey & Birge (1979). Adult values not shown. For mammalian species, including human (see Davson, 1967) and marsupials mean values are between 23 and 31 mg (100 mL)⁻¹. Chicken is 141 mg (100 mL)⁻¹.