def has_no_narrow_start(neuron, frac=<NUM_LIT>):
bad_ids = [(neurite.root_node.id, [neurite.root_node.points[<NUM_LIT:1>]])<EOL>for neurite in neuron.neurites<EOL>if neurite.root_node.points[<NUM_LIT:1>][COLS.R] < frac * neurite.root_node.points[<NUM_LIT:2>][COLS.R]]<EOL>return CheckResult(len(bad_ids) == <NUM_LIT:0>, bad_ids)<EOL>
Check if neurites have a narrow start

    Arguments:
        neuron(Neuron): The neuron object to test
        frac(float): Ratio that the second point must be smaller than the first

    Returns:
        CheckResult with a list of all first segments of neurites with a narrow start