Conditionals in Templates

I'm generating a table. I want the cells to be different depending on the type of the content. How do I test for the type of the content? I'd like to do something like this.

            <tbody>

            {% for row in rows %}

                <tr>

                    {% for cell in row %}

                        <td>

                                {% if isinstance( {{ cell }}, list) %}

                                    <ul>

                                    {% for element in cell %}

                                        <li>{{  element  }}</li>

                                    {% endfor %}

                                    <ul>

                                {% else %}

                                    {{ cell }}

                                {% endif %}

                        </td>

                    {% endfor %}

                </tr>

            {% endfor %}

            </tbody>

But "{% if isinstance( {{ cell }}, list) %}" is not allowed. Apparently I can't call a function in an {% if ...  %} tag.  Is there another way to do this?

Thanks.

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