enable passing chemistry

if [[ -n $description ]]; then

    d="--description=$description"

fi

c=""

if [[ -n $chemistry ]]; then

     c="--chemistry=$chemistry"

fi

n=""

if [[ -n $ncells ]]; then

    n="--force-cells=$ncells"

        --sample=$SAMPLE \

        $d \

        $n \

        $j

        $j \

        $c

"

cellranger count --id=$id \

        --sample=$SAMPLE \

        $d \

        $n \

        $j

        $j \

        $c

#        --noexit

#        --nopreflight

end=`date +%s`