Congenital anosmia

Congenital anosmia reads as two disjoint R19 failure modes: a CNG channelopathy where the transduction switch cannot flip (≈229× shallower), and Kallmann organ-formation where the apparatus never clears its presence threshold. Both are direction-only; CNGB1 loss is predicted to hit smell and rod vision.

Two disjoint R19 failure modes: CNG channelopathy (deleting the cubic destroys the flip, ≈229× shallower) and Kallmann organ-formation (the Organ never clears its presence threshold). CNGB1 loss is forced to impair both smell and rod vision. Direction-only, non-clinical.

Failure mode 1 — channelopathy: the transduction switch cannot flip

The olfactory CNG channel is the inherited R19 transduction switch. In a loss-of-function the bistable switch is gone (the cubic struck out), so there is no on-basin and the flip can never occur at any drive — no transduction, no smell. This re-points the cubic's necessity (§2) as the failure.

CNG channelopathy genes: wild-type flips on past h*; with the switch removed the field stays low at the same drive (graded, no on-basin).
gene	γ	h* = spinodal	WT s @ 1.10 h*	LOF (no switch) @ 1.10 h*
CNGA2	1.2935	0.56624	+1.3276	+0.4815
CNGB1	1.4357	0.66213	+1.3987	+0.5073

Losing the switch costs the all-or-none flip entirely: the wild-type slope ≈ 177 collapses to ≈ 0.77 (a factor ≈ 229×). The direction-only lever is to re-enable a flip reachable by physiological drive (sign +). No dose, molecule, or efficacy is stated.

Failure mode 2 — organ-formation (Kallmann): the apparatus never emerges

Here the smelling apparatus never forms: the master switch never clears its R19 presence threshold, so the organ is absent ("parts present ≠ trait"). The signature is anosmia with hypogonadotropic hypogonadism — the shared olfactory-placode/GnRH programme failing together.

The 4 Kallmann organ-formation genes (all measured): below threshold the Organ is absent; above it, present.
gene	γ	h* = spinodal	LOF: present @ 0.90 h*	WT: present @ 1.10 h*
ANOS1	1.4798	0.69287	absent	present
FGFR1	1.4785	0.69196	absent	present
PROK2	1.4634	0.68139	absent	present
PROKR2	1.4781	0.69168	absent	present

The direction-only lever is to restore the master switch's clearing of its presence threshold (sign +). The absolute magnitude and developmental window are an [O] this volume does not supply.

Cross-sense and the firewall in action

Because CNGB1 (γ = 1.4357, h* = 0.66213) is the same gene in both senses, a CNGB1 loss-of-function is predicted to fail in two senses at once — olfaction and rod-mediated dim-light vision — forced by the shared primitive, a cross-sense prediction rather than an analogy.

Every statement here is direction-only: it gives only the failure-mode class (which R19 primitive fails) and the sign of a hypothetical restorative lever. No diagnosis, dose, molecule, or efficacy; the odorant key stays [O]; the felt experience of anosmia is the mind volume's.