3 H-Proline, 3 H-asparagine and Na 2 35 SO 4 have been found to be highly specific markers for axonal transport in the goldfish visual system. The amino acids label both rapidly and slowly transported proteins while the 35 S is recovered mainly with the rapidly transported materials, including protein-bound mucopolysaccharides. These precursors have been used to study the rate of transport, the subcellular distribution and the rate of turnover of transported proteins in the nerve terminals.
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http://deepblue.lib.umich.edu/bitstream/2027.42/50075/1/480020409_ftp.pdf