Figure 4.
Processing of the Aplysia SPTR prohormone as detected by MALDI-TOF MS in individual cerebral and buccal neurons, and cerebrobuccal connective. (a), a cerebral neuron in the M cluster; (b), a buccal neuron on the rostral surface; (c), cerebrobuccal connective. Detected peptides, apSPTR-GF-DP1 and apSPTR-GF-DP2 are labeled. Average mass accuracy of assignment calculated from six measurements (4 neurons and 2 samples of CBC) is 8 ppm and 4 ppm, respectively. Additional known detected peptides: SCPs, FRF, PEP, and thymosin β4 are also labeled.