Propositions 1. All components of 'modern' auxin biology originated in the ancestors of land plants. (this thesis) 2. Despite the lack of key protein domains, non-canonical components are important for diversity and specificity in auxin biology. (this thesis) 3. 'Not all disabilities are immediately visible' -applies not only to priority seats in public transport but also to mutant phenotypes in the plant sciences. 4. Generating data is not the way forward, extensive interpretation with minimal

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... testing is the key. 5. Low expectations and little deliberation are the key factors of success in 'arranged' marriages. 6. Respect and trust of humans are taken over by fear and control. Propositions belonging to the thesis, entitled Evolutionary analysis of a billion years of auxin biology