Skip to content
Onto2DEvolutionary Contingency Lab
LTEE Evolutionary ContingencyVerifying artifact

10 / Embodied history -> future accessibility

The present was still Cit-.
The future was not equally open.

Replay experiments started from recorded moments in Ara-3 history. Cit+ appeared from some backgrounds under bounded protocols, showing that prior history changed observed accessibility without making any single future inevitable.

Source
Blount, Borland & Lenski / PNAS 2008
Retrieved
Loading
Case identity
Loading
Source identity
Loading
Canonical build
Frozen bytes / no live network
EXACT RESULT

Seven of sixteen source-generation labels yielded Cit+ in at least one selected replay. The other nine are unresolved—not inaccessible—and the three protocols remain separate.

01 / Bounded evidence

What is actually in the release

Counts describe exact rows and experimental units. They are not one pooled mutation rate.

02 / Replay matrix

One background, one protocol, one bounded observation

Choose a protocol or click a cell. “Not run” is missing evidence; “not observed” is a completed bounded observation with zero independent Cit+ mutants.

Ara-3 sourceReplay 1Replay 2Replay 3Bounded reading
Cit+ observedNot observedNot run

03 / Experimental context

Three designs, deliberately not pooled

Different units, scale, and duration change what each count means. Select a protocol above to highlight its exact description.

04 / Published statistical result

Every observed mean shifts later

The cards reproduce Table 2. P values and the combined bound are published results, not new Onto2D computations.

05 / Source audit

One number does not silently disappear

PUBLISHED TABLE 2—expected mean / replay 2
SIMPLE TABLE 1 CHECK—replicate-weighted mean

06 / What the result gives us

History changes the menu of reachable futures

SUPPORTED

Background matters

Under these experiments, later Ara-3 samples were more likely to yield Cit+ than the null model expected.

NOT DETERMINISTIC

History does not force the outcome

Many replays from later samples still produced no Cit+ observation. Potentiation changes propensity, not destiny.

CONDITIONED

The protocol is part of the question

Reachability here means “observed from this background under this exact replay,” not accessibility in every environment.

UNRESOLVED

Generation is not the mechanism

The selected tables do not identify a unique potentiating mutation, genotype, or clone-level causal chain.

07 / Historical Load

A strong candidate, not an invented scalar

LTEE is a priority candidate for a future empirical Historical Load study. The current release remains bounded: The published mean-generation shifts and P values quantify history-conditioned propensity; they are not substitutes for dH.

—CANDIDATE / NOT EVALUATEDnull in this release, not zero

08 / Reading discipline

A precise claim is more useful than a larger one

OBSERVED

Seven source generations

Cit+ appeared from these labels in at least one selected replay protocol.

NOT OBSERVED

Nine unresolved labels

The bounded evidence contains no Cit+ there; it does not prove impossibility.

ATTRIBUTED

Published interpretation

The potentiated-background conclusion remains explicitly attributed to the paper.

NOT CLAIMED

Unique causal mutation

No mutation or complete genetic route is invented from a generation-indexed table.