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docs: add missing backtick #1072

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docs: add missing backtick #1072

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2 changes: 1 addition & 1 deletion docs/src/model_creation/reactionsystem_content_accessing.md
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# [Accessing model properties](@id model_accessing)
Catalyst is based around the creation, analysis, and simulation of chemical reaction network models. Catalyst stores these models in [`ReactionSystem](@ref) structures. This page describes some basic functions for accessing the content of these structures. This includes retrieving lists of species, parameters, or reactions that a model consists of. An extensive list of relevant functions for working with `ReactionSystem` models can be found in Catalyst's [API](@ref api).
Catalyst is based around the creation, analysis, and simulation of chemical reaction network models. Catalyst stores these models in [`ReactionSystem`](@ref) structures. This page describes some basic functions for accessing the content of these structures. This includes retrieving lists of species, parameters, or reactions that a model consists of. An extensive list of relevant functions for working with `ReactionSystem` models can be found in Catalyst's [API](@ref api).

!!! warning
Generally, a field of a Julia structure can be accessed through `struct.fieldname`. E.g. a simulation's time vector can be retrieved using `simulation.t`. While Catalyst `ReactionSystem`s are structures, one should *never* access their fields using this approach, but rather using the accessor functions described below and in the [API](@ref api_accessor_functions) (direct accessing of fields can yield unexpected behaviours). E.g. to retrieve the species of a `ReactionsSystem` `rs`, use `Catalyst.get_species(rs)`, *not* `rs.species`. The reason is that, as shown [below](@ref model_accessing_symbolic_variables), Catalyst (and more generally any [ModelingToolkit]https://github.com/SciML/ModelingToolkit.jl system types) reserves this type of accessing for accessing symbolic variables stored in the system. I.e. `rs.X` refers to the `X` symbolic variable, not a field in `rs` named "X".
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