Open a protein-vaccine example, build a response with traceable cell lineages, and compare later encounters. Then follow the separate route from vaccine mRNA to a protein.
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vaccines-1 · content 1 · setup format 1
What supports the explanation?
Specified recombinant HBsAg formulation and manufacturing origin
Section 11, Description. Noninfectious purified surface antigen produced in engineered yeast and adsorbed on aluminum hydroxide. Revised May 2026; no clinical dosing content is imported into the model.
Human recall after earlier recombinant HBsAg vaccination
Adults in a phase IV single-group vaccine-challenge study; antibody and cellular responses, not deliberate infection or a randomized naive comparison. DOI 10.1111/jvh.13125.
PDB 8YMJ, assembly 1: 80 protein chains already present, reported 6.6 Å reconstruction. Wang et al., Science 2024, DOI 10.1126/science.adp1453. Recombinant HEK293F research expression, distinct from the documented formulation.
Qualitative causal sequences and stipulated non-cross-reacting A/B targets. Real antigens have many epitopes, and cross-recognition is more complex.
The primary-response chapter can stand for processes across an appropriate primary course. One playback is not one dose, a schedule or a completed vaccination status.
Existing memory in the comparison is an explicit initial condition with a recorded earlier-response history. It is not a guaranteed result for every vaccination.
Later removes selected transient material while keeping selected persistent compartments. It is not an antibody-decay equation or a protection-duration prediction.
The protein and mRNA examples are different platforms. The mRNA branch must not be read as an approved mRNA hepatitis B product or as instructions for making or administering a vaccine.
No health score, personal inputs, infection challenge, laboratory interpretation or treatment recommendation is included. The at-home activity uses only paper and writing tools.
Professional cell pictures are credited medical illustrations; the original material and transport diagrams are enlarged teaching models. They are not microscopy or measured molecular trajectories.
One clearly identified protein example: The ENGERIX-B prescribing information, revised May 2026, documents the formulation used to ground the material explanation. Its name identifies evidence, not a recommendation or endorsement. The lesson does not model dose, administration, schedules, eligibility or individual response.
Native recognition and linked presentation: The B receptor binds intact antigen. The CD4-helper receptor recognizes an appropriate peptide–MHC II complex. The B cell can present a peptide from what it captured, linking its antigen selection with compatible help. The grouped signals control represents several prerequisites; a successful click is not a sufficient-condition prediction for a living immune system.
Cell identities have a history: The model records each descendant’s parent and role. Expansion is biological cell division and differentiation, represented by a few layout icons. These counts are neither concentrations nor fixed daughter-cell yields. Resting memory cells do not emit the secretion arrows; plasma-cell descendants do.
Germinal centers add more than a simple branch: Real B-cell responses can include germinal-center selection and maturation involving specialized helper and stromal-cell interactions. Conventional dendritic cells and follicular dendritic cells have different roles. The executable comparison omits receptor mutation, affinity selection and this detailed anatomy, rather than claiming every first antibody is a perfect fit.
Recall is not an efficacy meter: The comparison records available components and necessary processes. It has no disease-outcome probability. Existing antibody can bind a matching antigen while memory reactivation and production of additional secretory descendants take separate steps. Protection depends on the vaccine, pathogen, person and measured outcome.
A platform explanation has boundaries: The mRNA delivery sequence abbreviates uptake, endosomal escape and cytoplasmic translation. Not all delivered RNA necessarily escapes or is translated. Its material is not conserved as one icon changing into a protein: cellular amino acids supply the separate product. No universal copy number, escape efficiency or half-life is assigned.
What the human study actually tested: Van Damme and colleagues studied adults vaccinated against hepatitis B roughly two to three decades earlier. After a further HBsAg vaccine dose, they assessed antibody and antigen-specific cellular responses, including visits seven and thirty days later. This single-group study supports recall in its participants; it did not deliberately infect them or provide a randomized naive comparison. Its measurements do not set the animation’s timing.
What has been checked
Analytical reference cases, conservation or transition invariants, finite drawing commands, bounded setup parsing, discovery and route integrity are checked automatically. These checks do not establish anatomical fidelity, learner outcomes or browser/device compatibility. Independent subject review, learner trials, comprehensive accessibility review and browser video encoding checks remain pending.
Each source supports the associated claim. Sources do not certify this implementation or its visuals.
About the cover illustration
Original offline rendering of the source-derived PDB 8YMJ structure used in the lesson. Deposited coordinate data are CC0; processing, omissions and source attribution are recorded in the downloadable manifest. The cover is a molecular representation, not a photograph or a protection forecast.