| CPC C12M 41/32 (2013.01) [G01N 35/00584 (2013.01); G01N 35/1002 (2013.01); G01N 2035/00673 (2013.01)] | 14 Claims |

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10. An apparatus, comprising:
a tray assembly including
a tray having a first transparent portion and a second transparent portion;
a first container including a transparent portion, the first container coupled to the tray such that the transparent portion of the first container is aligned with the first transparent portion of the tray;
a second container including a transparent portion, the second container coupled to the tray such that the transparent portion of the second container is aligned with the second transparent portion of the tray; and
a valve removably coupled to the tray and fluidically coupled to the first container and to the second container, the valve having a plurality of selectable ports;
the tray assembly configured to be removably coupled to a housing of an instrument with the first container, the second container and the valve coupled to the tray,
the valve configured to be removably coupled to a valve actuator of the instrument when removed from the tray while remaining fluidically coupled to the first container and the second container.
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