One chondrocyte and the matrix it keeps: move a slider and the territory, the budget and the readouts follow.
Matrix volume held per cell
102,171 um3 102,171 to 102,171 um3 across the sourced ranges. No sourced capacity for this quantity, so the bar places this cell between the smallest and the largest the sourced ranges allow.
One cubic millimetre of human articular cartilage holds a counted number of chondrocytes and a measured cell volume fraction. Divide the millimetre among the cells, take out the cell itself, and what is left is the matrix one chondrocyte is alone responsible for. No blood supply, no neighbour, no second cell in the lacuna. This is the quantity the cell must build and maintain, so it is the twin's budget.
source 1source 2,
Chondrocytes per mm3 (context constant)
9,626 cells/mm3
9,626 to 9,626 cells/mm3 exact
Cell share of tissue volume (context constant)
1.65 percent
1.65 to 1.65 percent exact
Aggrecan half-life (context constant)
95 days
95 to 95 days exact
Zone synthesis factor (context constant)
1 x
1 to 1 x exact
Tissue territory per cell
103,885 um3
103,885 to 103,885 um3 propagated
Volume of the cell itself
1,150 um3
1,150 to 1,150 um3 exact
Matrix held per unit of cell
88.8 fold
24.4 to 195 fold propagated
Volume turned over per day
745 um3/day
745 to 745 um3/day propagated
Turnover in units of the cell
0.648 cell volumes/day
0.178 to 1.42 cell volumes/day propagated
Demand at this zone factor
745 um3/day
745 to 745 um3/day propagated
Withheld
Aggrecan mass held per cell
No sourced value for this yet: converting the matrix volume to an aggrecan mass needs a measured aggrecan concentration in human articular cartilage, and no abstract read in this pass stated one, so the volume is shown instead
Collagen II synthesis rate
No sourced value for this yet: no abstract read in this pass gave a collagen II synthesis or turnover rate per chondrocyte, and the aggrecan half-life cannot stand in for it because collagen II turns over far more slowly
Pericellular matrix thickness
No sourced value for this yet: the pericellular matrix reviews read in this pass describe the structure and its mechanics without stating a thickness in micrometres, so no slider is offered for it
Oxygen tension at the cell
No sourced value for this yet: the low oxygen tension of deep zone cartilage is described in the reviews without a measured partial pressure in any abstract read in this pass
Chondrocytes per mm3
Tissue-level context: the twin shows one cell; density is a readout in derived (territory_volume) but has no body on the stage to scale. Slider removed; value feeds the derived calculations as its default.
Cell share of tissue volume
Tissue-level context: fraction of matrix vs cell in bulk tissue; feeds matrix_to_cell_ratio and matrix_volume_at_aggrecan_rate in derived but no drawn body carries this number.
Aggrecan half-life
Rate context: the aggrecan_turnover_near and _far processes in life.json use hardcoded ln(2)/halflife values; the generic engine cannot reroute a rate from a param slider, so the slider is removed. The halflife is stated in the life.json source notes.
Zone synthesis factor
Rate context: zone_synthesis rate in life.json is a fixed sourced value; the generic engine cannot scale it from this param. Slider removed; the factor is noted in zone_adjusted_demand in derived.