Assertion: cupule | /r/CapableOf | serve as an attractant source
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text: For example, the chemotactic behavior in the siphonophores has been described as follows (Cosson et al., 1984): spermatozoa show trajectories of large diameter (700-1000 [micro]m) while swimming far from the " cupule ," which in these species is an extracellular structure of the egg and serves as an attractant source, and trajectories of smaller diameter (200 [micro]m) in the vicinity of the cupule ; the transition between the two modes is progressive.