Expert-level developmental biology covering embryogenesis, cell fate determination, morphogen gradients, organogenesis, stem cells, and regenerative medicine.
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Fertilization: acrosome reaction, cortical reaction, zygote formation. Cleavage: rapid cell division without growth, blastomere formation. Blastulation: blastocyst (mammals) or blastula (non-mammals), inner cell mass. Gastrulation: three germ layers — ectoderm, mesoderm, endoderm. Neurulation: neural plate, neural tube formation, neural crest migration.
Induction: one tissue instructing adjacent tissue to change fate. Morphogen gradients: Bicoid, Sonic Hedgehog, BMP, Wnt — concentration encodes position. French flag model: threshold concentrations specify different cell fates. Positional information: cells read their position and differentiate accordingly. Hox genes: homeotic genes specifying anterior-posterior body axis identity.
Wnt: anterior-posterior patterning, cell proliferation, stem cell maintenance. Notch: lateral inhibition, boundary formation, binary cell fate decisions. Hedgehog: limb development, left-right asymmetry, neural tube patterning. FGF: mesoderm induction, limb outgrowth, tissue maintenance. BMP: dorsal-ventral patterning, bone formation, apoptosis.
Totipotent: can form entire organism including extraembryonic tissues. Pluripotent: can form all three germ layers (ESCs, iPSCs). Multipotent: restricted to specific lineages (HSCs, NSCs). iPSC reprogramming: Yamanaka factors (Oct4, Sox2, Klf4, c-Myc). Niche: microenvironment maintaining stem cell self-renewal.
| Pitfall | Fix |
|---|---|
| Confusing induction and competence | Both signal and receptive tissue required |
| Morpholino off-target effects | Always include p53 morpholino control |
| Oversimplifying stem cell potency | Potency is context and assay dependent |
| Ignoring extraembryonic tissues | Placenta and yolk sac profoundly influence embryo |
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Expert-level abstract algebra knowledge. Use when working with groups, rings, fields, modules, Galois theory, representation theory, or algebraic structures. Also use when the user mentions 'group', 'ring', 'field', 'homomorphism', 'isomorphism', 'normal subgroup', 'quotient group', 'Sylow theorem', 'Galois theory', 'polynomial ring', 'ideal', 'module', 'vector space', or 'representation theory'.
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Expert-level acoustics knowledge. Use when working with sound waves, acoustic propagation, resonance, standing waves, Doppler effect, room acoustics, ultrasound, noise control, musical acoustics, or architectural acoustics. Also use when the user mentions 'sound wave', 'decibel', 'frequency', 'resonance', 'standing wave', 'Doppler effect', 'acoustic impedance', 'reverberation', 'ultrasound', 'noise control', 'harmonics', or 'sound intensity'.
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Expert-level aerodynamics covering subsonic and supersonic flow, lift and drag, airfoil theory, boundary layers, compressible flow, and CFD methods.
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Expert-level air quality engineering covering pollutant sources, atmospheric dispersion, air quality standards, emission controls, and air quality modeling.
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Expert-level aircraft structures covering structural design philosophy, wing and fuselage analysis, fatigue and damage tolerance, composite structures, and certification.
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Expert-level algorithms and complexity theory covering sorting, searching, graph algorithms, dynamic programming, greedy algorithms, NP-completeness, and algorithm design paradigms.
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