L4

free-living male

Figure 20.1. Life cycle of Strongyloides ratti with two discrete developmental switches, shown as grey boxes: (1) a sex determination event; (2) a female-only developmental switch. Adapted from Harvey et al., (2000). Also included are larval stages L1-L4. The life cycle contains both parasitic and free-living generations; an adult parasitic female (left) and free-living adult female (right). Bars = 200 ^m.

Figure 20.1. Life cycle of Strongyloides ratti with two discrete developmental switches, shown as grey boxes: (1) a sex determination event; (2) a female-only developmental switch. Adapted from Harvey et al., (2000). Also included are larval stages L1-L4. The life cycle contains both parasitic and free-living generations; an adult parasitic female (left) and free-living adult female (right). Bars = 200 ^m.

However, the role of aging in this apparent difference was unknown.

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