<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def quantitate_expression_parallel(samples, run_parallel):
 """ quantitate expression, all programs run here should be multithreaded to take advantage of the threaded run_parallel environment """

    data = samples[0][0]
    samples = run_parallel("generate_transcript_counts", samples)
    if "cufflinks" in dd.get_expression_caller(data):
        samples = run_parallel("run_cufflinks", samples)
    if "stringtie" in dd.get_expression_caller(data):
        samples = run_parallel("run_stringtie_expression", samples)
    if ("kallisto" in dd.get_expression_caller(data) or
        dd.get_fusion_mode(data) or
        "pizzly" in dd.get_fusion_caller(data, [])):
        samples = run_parallel("run_kallisto_index", [samples])
        samples = run_parallel("run_kallisto_rnaseq", samples)
    if "sailfish" in dd.get_expression_caller(data):
        samples = run_parallel("run_sailfish_index", [samples])
        samples = run_parallel("run_sailfish", samples)
    # always run salmon
    samples = run_parallel("run_salmon_index", [samples])
    samples = run_parallel("run_salmon_reads", samples)

    samples = run_parallel("detect_fusions", samples)
    return samples