Setting
Description
Analysis Range
The range (in data points) to analyze:
• Full Range to analyze the entire scan region as collected by the genetic
analysis instrument, including the primer peak.
• Partial Range to analyze only data points within a specified range. Enter
Start Point in data points after the primer peak and before the first
required size standard peak. Enter a Stop Point after the last required
size standard fragment. Start and Stop points may vary from instrument
to instrument and platform to platform. Display raw data to determine
the appropriate analysis range.
Data points outside the specified analysis range are ignored.
Note:
Ensure the Analysis Range contains all size standard fragments
included in the Sizing Range specified below.
Sizing Range
The size range (in base pairs) appropriate for the kit you are using:
• All Sizes for the software to analyze fragments of all sizes in the
Analysis Range.
• Partial Sizes for the software to analyze only fragments within a
specified range. Enter a Start Size and a Stop Size appropriate for the
size standard used.
Size Calling Method
• Local Southern—(default) Determines the fragment sizes using the
reciprocal relationship between fragment length and electrophoretic
mobility.
• 3rd Order Least Squares—Uses regression analysis to build a best-fit
size calling curve.
• 2nd Order Least Squares—Uses regression analysis to build a best-fit
size calling curve.
• Cubic Spline Interpolation—Forces the sizing curve through all the
known points of the selected size standard.
• Global Southern Method—Compensates for standard fragments with
anomalous electrophoretic mobility (similar to least squares methods).
Primer Peak
If the primer peaks in your application obscure peaks of interest, select
Present. Selecting Present instructs the algorithm to ignore primer peaks.
Primer peaks are still displayed in the trace.
Note:
If this setting does not allow detection of the 20- and 40-mer peaks for
samples that use the GS600 LIZ
™
size standard, running samples with the
GS600(60
‑
600)LIZ+Normalization may allow detection of the peaks.
Peak Amplitude Thresholds
Specify the threshold (RFU) for peak detection for each dye color. Peaks
below the threshold are not detected.
For example, if you use the default values of 175, peaks with heights equal to
or greater than 175 are detected. Peaks with heights below 175 are still
displayed in the electropherogram plots but are not detected or labeled.
Note:
Use the same peak amplitude thresholds in secondary analysis
software.
Chapter 7
Manage library resources
Sizecalling protocols library (primary analysis—fragment)
7
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3500/3500xL Genetic Analyzer User Guide—Data Collection Software v3.1
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