The ASS1/CCP9 FISH Probe Kit is designed to detect the human ASS1 gene located on chromosome band 9q34.11, along with the number of chromosome 9 copies per cell. Abnormalities in ASS1 – also called ASS or CTLN1 – occur in citrullinemia type I (CTLN1), also known as classic citrullinemia.

The probe is labeled with CytoOrange and CytoGreen. CytoOrange is a fluorophore with an excitation peak at 551nm and emission peak at 575nm, giving it an orange fluorescent signal with an appropriate filter; CytoGreen has an excitation peak at 495nm and emission peak at 518nm, giving it a green fluorescent signal with an appropriate filter.

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