WPF: Formatting a label

I have the following code for an Expander:

   <Expander Name="CompanyLinks" Header="{StaticResource companyLinksHeader}"
              FontSize="18" FontFamily="Calibri" FontWeight="Bold">
        <StackPanel>
            <Label Content="{StaticResource companyLinksItemSummary}" 
                   FontSize="14" FontFamily="Calibri" FontWeight="Bold"/>
            <Label Content="{StaticResource companyLinksItemInfo}" 
                   FontSize="14" FontFamily="Calibri" FontWeight="Bold"/>
            <Label Content="{StaticResource companyLinksItemIssues}" 
                   FontSize="14" FontFamily="Calibri" FontWeight="Bold"/>
            <Label Content="{StaticResource companyLinksItemMessages}" 
                   FontSize="14" FontFamily="Calibri" FontWeight="Bold"/>
        </StackPanel>   
    </Expander>

The StaticResources are defined as follows (in my resource dictionary):

<sys:String x:Key="companyLinksHeader">company</sys:String>
<sys:String x:Key="companyLinksItemSummary">summary</sys:String>
<sys:String x:Key="companyLinksItemInfo">info</sys:String>
<sys:String x:Key="companyLinksItemIssues">issues</sys:String>
<sys:String x:Key="companyLinksItemMessages">messages</sys:String>

Is there a way to define a dictionary entry (or something else) that will handle the Font styling for the Header and Labels so that I don't have to define the same font over and over (and only change it in one place should I want to change the font)?

EDIT

I found a solution (thanks to those that posted) and am using the following Style for the StackPanel Label items:

<!-- Expander Items text style -->
<Style x:Key="expanderItemsTextStyle">
    <Setter Property="Label.FontFamily" Value="Trebuchet MS"></Setter>
    <Setter Prop