. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. APLYSIA PHEROMONAL ATTRACTANT 17. 76 aa iQNCDIGNITSQCQMQHKNCEDANGCDTIIEECKTSMVERCQNQEFESAAGSTTLGPQ QNCD I GN I TSOCQMQH!lNc3DANGCDTI I E E C KT S MVE RC Q NQE FE S A Figure 1. I A) Schematic diagram of the precursor to the uttractin pherotnone from the albumen gland of .A/>'(i californica. Cleavage of the signal sequence (arrow) generates the 58-residue pheromone attractin. The disulfide-bonding pattern of cyxleine residue-. (S) is I-IV. II-V. and 11I-1V, where the Roman numeral indicates the order of occurrence in t
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. APLYSIA PHEROMONAL ATTRACTANT 17. 76 aa iQNCDIGNITSQCQMQHKNCEDANGCDTIIEECKTSMVERCQNQEFESAAGSTTLGPQ QNCD I GN I TSOCQMQH!lNc3DANGCDTI I E E C KT S MVE RC Q NQE FE S A Figure 1. I A) Schematic diagram of the precursor to the uttractin pherotnone from the albumen gland of .A/>'(i californica. Cleavage of the signal sequence (arrow) generates the 58-residue pheromone attractin. The disulfide-bonding pattern of cyxleine residue-. (S) is I-IV. II-V. and 11I-1V, where the Roman numeral indicates the order of occurrence in the primary sequence (Schein el 2001). Unlike attractin. the precursors for pheromones that act as part of a group of scents often contain sequences of more than one scent. (B) The amino acid sequences of attractin from the two species of Aplysia used in the current studies, A. californicu and A. briisiliiinu (Painter el 1998, 2000). Amino acid residues that are identical to those in A. californica attractin are indicated h\ the black background. gregations during the reproductive season. The aggregations typically contain both mating and egg-laying animals and are associated with masses of recently deposited egg cor- dons, often deposited one on top of another. Most of the egg-laying animals mate simultaneously as females even though mating does not cause reflex ovulation (Blankenship ft al., 1983), suggesting that egg laying precedes mating in the aggregation and that egg laying may release pheromones that establish and maintain the aggregation. Similar observations have been made in the laboratory when animals were not individually caged (Audesirk. 1979; Blankenship et 1983; Susswein et 1983, 1984). and behavioral studies have shown that egg-laying animals with cordons are more attractive than sexually mature but non- laying conspecifics (Aspey and Blankenship, 1976; Jahan- Parwar. 1976; Audesirk. 1977; Painter et 1989). T-maze assays show that at lea
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
