public Builder clearServiceAccount() {
      bitField0_ = (bitField0_ & ~0x00000200);
      serviceAccount_ = null;
      if (serviceAccountBuilder_ != null) {
        serviceAccountBuilder_.dispose();
        serviceAccountBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
The Google Cloud Platform Service Account to be used by the TPU node VMs.
If None is specified, the default compute service account will be used.
</pre>

<code>.google.cloud.tpu.v2alpha1.ServiceAccount service_account = 37;</code>
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/Node.java