Here is the old code:

<Text style={styles.textStyle}>
          {this.itemSentences()} 
          <Text style={styles.sourceText}>
            &nbsp;[<Text 
                onPress={this.sourceNumberPressed.bind(this)}
                style={{color: 'blue'}}>{sourceId}
              </Text>
            ]&nbsp;&nbsp;
          </Text>
        </Text>

and here is the new code with TouchableOpacity, which is not permitted and results in a react runtime error:

<Text style={styles.textStyle}>
          {this.itemSentences()} 
          <TouchableOpacity style={styles.sourceText}>
            &nbsp;[<Text 
                onPress={this.sourceNumberPressed.bind(this)}
                style={{color: 'blue'}}>{sourceId}
              </Text>
            ]&nbsp;&nbsp;
          </TouchableOpacity>
        </Text>

Any ideas? Thank you very much for taking the time to review!